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Brakes lock up 1992 Bounder Marviin 6-27-16  
I have changed master cylinder (it was leaking ) hydro boost. Unhooked parking break and still in about four
miles the breaks lockup. I have seen a lot of post about this but no answers.Can someone give me some help ?
Re: Brakes lock up 1992 Bounder Bubba The Bus Tech 6-28-16  
It depends on what locks up, all front or rear.

If all Check in this order: Push rod length from paddle to hydrobost and Hydro boost to master. This is a very common problem with "Will Fit and Will work" parts like you had to buy. if it is to long you get this problem, brakes unlock after a wait: 5 minutes too 1 hr. Faulty Hydroboost. Seen several bad out of the box.

If only one end locks up or one wheel, change the brake flex hoses but first make sure you don't have a seized brake caliper or wheel cylinder.

Good Luck
Re: Brakes lock up 1992 Bounder Aaron D 10-19-16  
Ok, I just put in my 3rd mastercylinder, most likely not the problem!

We are working on my 92 chevy chassis pace arrow p30. I have a fantastic mechanical, driveline ebrake which functions perfectly! I have 4 wheel disc brakes, which were functioning properly until they applied themselves! Seriously guys, driving down the grade and these suckers slowly grabbed. It was like I was doing this for a stop light. Let my motty cool off for a day and she goes fine for 3-5 miles then bam, no sukka you are slowing down! The rear brakes are good, but, the fronts will lock completely up, let it sit for a day and here we go, another 3-5 miles. I'm a mechanically inclined guy but this has me stumped! It is only the front brakes, not the rear!

I've replaced the front brake lines and calipers, fixing to replace the rear calipers just for good measure.

What do I do? What is the next thing? It's only the fronts!
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