(800) 853-2651
SHOP NOW

Help with a 1967 Mustang

B

Brent Zappe

Member
Okay I know this is not a tractor but I need a little help here. I bought another mustang and the brakes are very poor on it. It came factory with Power front disk brakes and an automatic transmission. I have looked threw the brakes and there are all okay. what I am thinking is the power brake booster and the master cylinder needs to be replaced. question since the car has a automatic should I look for a unit for an automatic transmission. Could the people I bought the car from might have put a different one in it. Could that made the brakes so poor on the car or is that just a different price but the same unit.
 
check to see if it has a proportioning valve. could be it is either missing or froze up. should be the same booster/master or stick or automatic.
 
In 1967 your mustang may have came with front drum brakes and someone converted it to disc.
Does it have the proper master cylinder on it?
Two chamber one larger than the other.
 

The brakes can and will rust up, freeze up and need to be completely serviced. Lots of these mustangs sit a long time and this is common. SO... you will need to check it all from master cyl to caliper to wheel cyls.... and the brakes on these models ALWAYS took a lot of pressure as opposed to modern brakes.


The power version was significantly better, but not anywhere near modern brakes...

Push the pedal down, and then start the car and see if it goes down further when the engine starts... this will test the vacuum booster. If the booster is bad or getting no vacuum from the engine, the brakes will be very hard to stop.

Caliper pistons can get a rust ring and freeze up also. wheel cyls will go bad and leak,, shoes can glaze.
 
Some mustangs had disc brakes on the front when disc brakes were introduced, seems to me if it had a high perf. engine it came with disc brakes.

Pete
 
If it has power brakes, it should be able to easily lock up all four wheels. Or at least the rear brakes. Can you feel any difference in the pedal if you hold the brakes while starting the engine? If the pedal doesn't get softer when you start the engine, you have a bad booster.
 
67 should have 4 piston calipers if its factory. IF it were mine, Id look into something aftermarket. It will be much safer. Boosters should be the same, IIRC.
 
Well..........that ought to settle it!
"I agree with determined, disk brakes were not original."
"67 should have 4 piston calipers if its factory."
 
Well Disc brakes were and option back then and before 67 and myself i have only worked on them one time and that was many moons ago . So i do not remember much on it other then the one i was working on was having brake piston sticking issues and it was the first car the dealer ever delt with with disc brakes . I know that you could get ft. disc's on them in 65 as i was looking at a brand new Stang that had the 289 305 Hp. four gear with the Pony interior and it had PoWER disc ft.
 
Disk brakes in front were a $65 option in 1967. Even available on the first 1964 1/2 models for $58.
 
Master cylinder if worn won't affect brake power as long as the full pedal it there (no air in the lines making you have to pump the pedal). A stuck booster will make the brakes weak. Correct booster is a 7 1/2" unit and the same for any engine or transmission as long as you have the power front disc brake system. Master cylinder for the power disc system has different port sizes then for the manual drum brake system so they cannot be swapped without mods.
 
What do you mean by poor? To much peddle resistance? Soft peddle? Good peddle feel but no stopping power? Rear brakes lock up first?
 
stock or built engine?
Some cams can mess up the vacuum for the booster.

funny....musta been one of those 'who needs em' things back then.
I've owned 20 or so late 60's Mustangs...all had manual brakes.
Couple made me scratch my head wondering...
69 Mach 1, Q-code 428CJ....manual brakes...huh?
another weird one that I still own,
68 Fastback, J-code 4bbl 302, toploader 4-speed,....deluxe interior, center console, roof console, fold-down rear seat, power steering....lots of options.....and manual brakes. ?
 
(quoted from post at 14:09:52 07/07/17)
(quoted from post at 14:41:38 07/07/17) The difference is I know what Im talking about.
Click to expand...
all better listen to John M napa shows the 4 piston for that 67 mustanghttps://www.napaonline.com/en/p/SEBSE4956
Click to expand...

Did not read where anyone said front disc were not available from the factory in 1967.
I stated the car could have come with front drum which was common in 1967.
In the process of a very common upgrade someone might not have used all the correct parts when converting to front disc, causing the poor braking as described.
 

I see a lot of time in the parts catalog figuring out what is there and what should be there.

I kinda doubt they sold disc brakes without power assist. Drums have this self-energizing thing going, where the shoe tends to jam itself into the drum.

Disc brakes are all about how hard you can jump on that pedal, no self-energizing at all. Why you need a booster....
 
Define poor and you will get better responses. I had 67 Cougar , power disc front brakes were the 4 piston calipers in 67, if yours are not 4 piston then not original and you may have Frankenstein, give is a little more info on what the problem is and maybe some pictures and hopefully someone will get your problem figured out. It should be able to lock up all 4 wheels, I know mine could. I also had a 4 wheel drum manual and it could lock up all 4 also but suffered more brake fade during stops from higher speeds.The aftermarket 4 wheel disc kits are far superior to either of the original brake setups on those cars and would be a good option if you are keeping it as a driver.
 
(quoted from post at 16:43:33 07/07/17)
(quoted from post at 14:09:52 07/07/17)
(quoted from post at 14:41:38 07/07/17) The difference is I know what Im talking about.
Click to expand...
all better listen to John M napa shows the 4 piston for that 67 mustanghttps://www.napaonline.com/en/p/SEBSE4956
Click to expand...

Did not read where anyone said front disc were not available from the factory in 1967.
I stated the car could have come with front drum which was common in 1967.
In the process of a very common upgrade someone might not have used all the correct parts when converting to front disc, causing the poor braking as described.
Click to expand...
avid G
Tractor Guru


Joined: 11 Jan 2008
Posts: 18018


Report to Moderator

PostPosted: Fri Jul 07, 2017 9:47 am Post subject: Re: Help with a 1967 Mustang Reply to specific post Reply with quote


I agree with determined, disk brakes were not original.
 
(quoted from post at 17:44:53 07/07/17)
(quoted from post at 16:43:33 07/07/17)
(quoted from post at 14:09:52 07/07/17)
(quoted from post at 14:41:38 07/07/17) The difference is I know what Im talking about.
Click to expand...
all better listen to John M napa shows the 4 piston for that 67 mustanghttps://www.napaonline.com/en/p/SEBSE4956
Click to expand...

Did not read where anyone said front disc were not available from the factory in 1967.
I stated the car could have come with front drum which was common in 1967.
In the process of a very common upgrade someone might not have used all the correct parts when converting to front disc, causing the poor braking as described.
Click to expand...
avid G
Tractor Guru


Joined: 11 Jan 2008
Posts: 18018


Report to Moderator

PostPosted: Fri Jul 07, 2017 9:47 am Post subject: Re: Help with a 1967 Mustang Reply to specific post Reply with quote


I agree with determined, disk brakes were not original.
Click to expand...


Read a little more carefully.

The exact words in my post;

(In 1967 your mustang may have came with front drum brakes and someone converted it to disc.)

Front drum brakes were more common than front disc on a 1967 Mustang.
While not impossible it is very likely it was converted and the front disc brakes on his specific car are not original even though they were available as a factory option.

Anyone who agreed with what I wrote were merely agreeing that the odds are the car in question did not originally have front disc brakes on it when it left the factory.

Most who have replied are working toward a solution to the problem as many of us make or made a living doing this at one time or another.
 
(quoted from post at 19:29:10 07/07/17)
(quoted from post at 17:44:53 07/07/17)
(quoted from post at 16:43:33 07/07/17)
(quoted from post at 14:09:52 07/07/17)
(quoted from post at 14:41:38 07/07/17) The difference is I know what Im talking about.
Click to expand...
all better listen to John M napa shows the 4 piston for that 67 mustanghttps://www.napaonline.com/en/p/SEBSE4956
Click to expand...

Did not read where anyone said front disc were not available from the factory in 1967.
I stated the car could have come with front drum which was common in 1967.
In the process of a very common upgrade someone might not have used all the correct parts when converting to front disc, causing the poor braking as described.
Click to expand...
avid G
Tractor Guru


Joined: 11 Jan 2008
Posts: 18018


Report to Moderator

PostPosted: Fri Jul 07, 2017 9:47 am Post subject: Re: Help with a 1967 Mustang Reply to specific post Reply with quote


I agree with determined, disk brakes were not original.
Click to expand...


Read a little more carefully.

The exact words in my post;

(In 1967 your mustang may have came with front drum brakes and someone converted it to disc.)

Front drum brakes were more common than front disc on a 1967 Mustang.
While not impossible it is very likely it was converted and the front disc brakes on his specific car are not original even though they were available as a factory option.

Anyone who agreed with what I wrote were merely agreeing that the odds are the car in question did not originally have front disc brakes on it when it left the factory.

Most who have replied are working toward a solution to the problem as many of us make or made a living doing this at one time or another.
Click to expand...
ok Sir can you show me where I addressed you in any form or fashion? David G was the one who said "disk brakes were not original" I only gave proof that there was indeed a 67 mustang with factory disk brakes I'm done with it you have your self a good night
 
After the day of working on it and looking. I discounted the power Break booster from the vacuum manifold and it ideal great. So What they had told me the booster unit is bad. After that I got on my computer and did a serial number research on the vin numbers and yes it does show from Factory that it was order with the optional front disk brakes (four piston Calipers set up). Went to my Auto parts store ordered a Rebuilt power Booster, A new Brake master unit, Front pads and new bake brake shoes with two new drums. I would like to say thank you to every body's replay it some how did help out a lot. Thank you again.
 
Thank you for your reply. What happens when you run a big racing cam is you vacuum drops down in operation for that power booster and I would like to add it does not help on an automatic transmission. When I get in to building a 289 OR 302 I usually have to ask what type of brakes and transmission is in the car. If it has the set up my car has I would put a Vacuum canister in it. This would build up the vacuum to give those ideas to do there job. What is interesting is that FORD did this with the 67,68,69 cougars. this canister would hold vacuum for the lights doors, Air conditions system for that car. Thank you again for your replay.
 
What I meet about Poor brakes is that the braking system is not up to what it should be. The car is not stopping in the distance it should and it takes more to slow it down to a stop. What I found was the power brake booster unit is bad. Since it is Vacuum operated it is causing the engine to have a rough ideal. due to the fact it is now getting a lot of air threw the broken booster which told me this was bad. Realizing that this unit will make the master cylinder unit go bad it is a good and safe ideal to change both unit together.
 
You got it right. Your Cougar has the same brake system as this mustang has on it. Your cougar has a little vacuum canister on it that runs your Head light Doors and the Air conditioning systems. what I really like about those cars was the tilt steering wheel (how it moved away from you when you open the door to get out). I think that was in the XR7 models.
 
Yes you are right. This statement is true. This was an item usually ordered if you had bought the high end of the sporty type mustang. It really helps to stop when you need to.
 
You must log in or register to reply here.

Similar threads

G
Help identifying a super major
Replies
5
Views
559
Gugge
G
O
MF135- Wet Brakes
Replies
5
Views
256
cabot
C
G
Help with my 1958 J.I. Case 420B Industrial
Replies
17
Views
732
Joe (Wa)
J
G
  • Question
Help with a IH 660
Replies
2
Views
398
rustred
rustred
K
JD 6068HI550 throttle problem
Replies
2
Views
186
ADB-Ia
ADB-Ia
Tractor Parts Tractor Manuals

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top