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O/T Loadstar Brakes

A

Anonymous-0

Well-known Member
Got a 1975 Loadstar 1600. When I bled the brakes all the way around I didn't have any air. I can't find any leaks. I have to pump the brakes about 2 or 3 times every time before they are firm enough to do any stopping. Diagnosis?

Thanks
 
Set them up. There is too much space between the shoes and the drums so it takes a "pump" or two of the pedal to get the shoes moved out to the drums, then on the next "pump" there will be good brakes. "Til next time.
 
Some of these big systems don't like the pressure type systems. I found that putting a tube on the drain and insert it a bottle half full of fluid then pump the pedal real slow. I surprised that the cab hasn't rusted off that truck yet they are known for that.
Walt
 
Bob may very well be right but there is also a bleeder on the booster. Over time they will pickup air there and act just like you describe. Takes two folks but bleed screw is on the small part of the booster toward the end.
 
I had the same problem one time. Someone had put the wrong wheel cylinders on and the bleeders were on the bottom of the cylinder instead of the top. Got around it by slipping a feeler gauge in the top of the cylinder to bleed it.
 
Some boosters have 3 bleeders! They are Difficult to bleed and need the hose and jar device to assure no re-entry of air. There is a specific TSB for the process. Jim
 
Those IH trucks can be a real handfull to bleed. I have had a rock solid pedal one day and go to the floor first pump the next day, I have had the most success with back bleeding them.
 
You may need to adjust the brakes-they are not self adjusting like drum brakes on a newer pickup or car.
 
I would agree, it sounds like you don't get enough flluid into the wheel cylinders to make the shoes contact with just one pump. Might need to set the shoes up a little tighter if possible. I'm having real problems setting mine up as the heads of the adjusters are worn down to nothing and I can only turn them with pliers. Also good luck trying to buy new drums for this truck. I have tried everywhere I can think of and even IH says the 14 inch by 2.5 drums are no longer available. Waiting on a wrecker to find me some usable spares.
 
Bob has it. If you had air anywhere you would have a spongy pedal, no matter how many times you pumped the pedal. The master cylinders on these old trucks are very small compared to the wheel cylinders. So when the linings need adjustment it takes more fluid then is available making it necessary for the multiple pumps of the pedal.
 
When you bleed the brakes always start with the booster then right rear-farthest from the master cylinder then go to the left rear then right front to the left front.

If I remember correctly there are two adjusting stars on the 1600's. Lot of times they get froze up and need to be taken off and cleaned and
anti-seize put on them.

If you replaced the wheel cylinders make sure you installed them correctly with the bleeder on the top side and the brake line on the bottom side.

When we use to replace the wheel cylinders we use to fill them before installing them. We had a small hand pump that fit into a gallon can of brake fluid. Worked nice.

Those trucks can be a real pain when it comes to bleeding the brakes.
 
Thanks all.

I'll start with the booster & then move on to adjusting the shoes.

Where exactly is the booster hidden?
 
(quoted from post at 13:08:50 04/08/13) Thanks all.

I'll start with the booster & then move on to adjusting the shoes.

Where exactly is the booster hidden?
Click to expand...
In behind the driver's side running board on my 71. Bleed screw on top at the front of the booster.
 
These are the most impossible trucks to bleed the brakes that I have ever known..Thats even after replacing everything and having the brakes adjusted up..Even a power bleeder didnt work..
 
(quoted from post at 13:30:09 04/08/13) These are the most impossible trucks to bleed the brakes that I have ever known..Thats even after replacing everything and having the brakes adjusted up..Even a power bleeder didnt work..
Click to expand...
You are starting to scare me. I have just replaced the wheel cylinders on one front wheel and was hoping to get away without major bleeding the system.
 
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