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986 brakes

urbancase

urbancase

Member
anyone had this problem? picked up a 986 a few months back and when you step on the brakes they go all the way down and you hold for a second then they pump up hard. never had this problem with my 06 or 66 tractors. looking for a starting point as to what to look into first, and second, i think its seal but not sure.

thanks
 
Could be air in the system. You could start by bleeding them.

Could be wore out pads.It would take more oil to get them slide together before they grab.

Could be aleaky oil seal.

Once they do apply do they hold and does the pedal stay up?

If it was a seal I would think the pedal would still go down slow just holding it in place.

I betting on the wore pads myself.

That's what my 1086 did till I put pads in a while back.

Gary
 
Does the brake wear indicator light come on in the dash?? Is the sensor wire hooked up?? IIRC...The 86 series have this feature.
 
The 86 series does have brake wear sensors but with what they cost many have been been replaced with a plug.

If the brake discs get warped they can cause the symptoms you are describing. Leaking piston O-rings will also act that way.

Shut the engine off while holding the brakes on. If the pedal goes down with the engine off you have a leak. If the pedal stays up maintaining manual brakes most likely the plates are warped.
 
i had the same problem on our 186 last winter. I pulled the brakes apart and put in new o rings on the brake pistons. If I remember correctly there was 3 one each side but you have to be careful since there was a serial number breake and the one ring is a different size. the new orings made the brakes alot better.
 
thanks for the replys, i know were to start now.
i never tried to hold the brakes with the motor off will try to see what happens. looks like i will go to the dealer and get all the items to do a R&R on the brakes.
thanks
 
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