Brake Problem
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New User
Joined: Apr 2010
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Brake Problem
Truck brakes fine for a little while. Maybe 10 mins of driving. Then the brakes (I'm pretty sure its the front brakes) start to lock up. Not completely, but enough to be very noticeable. The brakes were replaced (calipers and rotors) right before I bought the truck. The master cylinder is old and rusty, and I don't believe the truck has a brake booster, though I must admit, I don't know where to look. Though I would expect it to be near the master cylinder. Pedal is already fairly stiff (probably because it doesn't have a booster), but when brakes start to lock up, it becomes even stiffer.
Any ideas on what to look at or replace?
Any ideas on what to look at or replace?
Freshman User
Joined: Oct 2009
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this happen to my friend the same thing happen we checked the fluid in the brake system found out that some jerk mixed power steering fluid in the master cil any way we drained all the fluid put the new stuff in worked find he bought this truck this way you might look at this the oil are differnt check this out its cheap to fix
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New User
Joined: Apr 2010
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this happen to my friend the same thing happen we checked the fluid in the brake system found out that some jerk mixed power steering fluid in the master cil any way we drained all the fluid put the new stuff in worked find he bought this truck this way you might look at this the oil are differnt check this out its cheap to fix
Fleet Mechanic
Joined: Feb 2007
Posts: 1,326
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From: Middle TN
The brake booster would be mounted between the master cylinder and the firewall about the size and shape of a cake.
You need to determine if the its the front or rear. Try finding a gravel road, apply the brakes and see which wheels are dragging.
You need to determine if the its the front or rear. Try finding a gravel road, apply the brakes and see which wheels are dragging.
Elder User
Joined: Aug 2004
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I know you said you think it is the front brakes, so this may not apply, but I'll throw it out there just in case. I bought my truck and it was fine, but after driving it for a while the brakes got more and more touchy. They started locking up at the slightest touch. My problem was leaking wheel cylinders on the rear.
It caused the pedal to be really soft for the first depression, then if you pumped it, it would catch way up high and lock up nearly instantly. It seems that drum brakes don't like having fluid leaked onto the pads.
Might be worth checking out anyway. I found that I could get whole new cylinders for only slightly more than rebuild kits.
It caused the pedal to be really soft for the first depression, then if you pumped it, it would catch way up high and lock up nearly instantly. It seems that drum brakes don't like having fluid leaked onto the pads.
Might be worth checking out anyway. I found that I could get whole new cylinders for only slightly more than rebuild kits.
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Yeah, I do that. Though I'm almost positive it is the front due to the fact that that is where the burnt smell is coming from and the front are scorching hot compared to the rears. Makes me wonder if it might have to do with the proportioning vavle. uhhhg, makes me wish I had a better understanding of brakes in general.
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