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Old 11-10-2010, 05:02 PM   #1
craig24671
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Brakes not working

I put a new master cylinder and power brake booster on my truck and have bled the brakes twice and they still have to be pumped up to make them work WTH? Can someone help me
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Old 11-10-2010, 05:11 PM   #2
cdowns
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Re: Brakes not working

have you followed the directions in the factory service manual for the proper way to bleed the brakes??
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Old 11-10-2010, 05:16 PM   #3
Sammy
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Re: Brakes not working

Still has air. So hard to bleed these trucks. After a bench bleed on MC you can try disconnecting the lines at each brake cylinder one at a time to insure they are getting fluid. (It isn't unheard of getting bad new/rebuilt master cylinders from parts houses)
Due a search on brake cylinder bleeding this has been a previously asked question. With folks spending several days trying to bleed them.
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Old 11-10-2010, 05:42 PM   #4
Lee H
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Re: Brakes not working

If you can't get the air out you should take your ride to a brake shop and have them bleed it. Your, as well as others, safety is at risk.
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Old 11-10-2010, 08:45 PM   #5
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Re: Brakes not working

Is it a disc drum set up? My first move would be to be SURE the the rear brake are adjusted properly. Secondly, I would check the clearance between the booster rod and the master cylinder. Here is what I do:
Unbolt the master cylinder without disconnecting the brake lines, get a small ball of clay 1/4" stick it on the booster rod, and bolt the master cylinder back to the booster. then unbolt the master cylinder and see if it has crushed. If not your rod from the booster needs to be a bit longer. you only need 1/16" clearance. I have welded a bead onto the booster rod to correct this.

All of the above is AFTER you are sure you have no air in the system. I have done a bunch of disc conversions, and never get excited until I have checked the booster/master clearance
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Old 11-10-2010, 09:17 PM   #6
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Re: Brakes not working

Thanks for the replies. I forgot to note that my calipers got super hot and I replaced the booster and master, and when i try to bleed the front fluid squirts back into the mastter in a solid stream, do ya'll think I possibly need to change the calipers to? I have never had a problem bleeding brakes by the way, it's a simple process.
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