Master Cylinder woes
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Senior User
Joined: Jun 2004
Posts: 205
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From: Florida
Master Cylinder woes
Well, decided it was time for a new master cylinder and brake booster (206,000 miles on them), so I got a bendix master cylinder and brake booster, got it all on and now i have a problem bleeding the rear brakes. I can pump the pedal and fluid comes out the front but I open the bleeder valve on the wheel cylinder on both back breaks and nothing comes out. No air, no fluid no nothing. I tried it like 20 times, and then went to the front(to make sure something was working) and it spits real good up there. What could be my problem, its almost like I have a blockage or something. Anyone have this happen?
Junior User
Joined: Jun 2005
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Sometimes, the bleeder screw will be packed with dirt..I will always pull the bleeder to clean it and then bleed/ before I started using speed bleeders . Now i want to change the fluid whenever it turns color, its that easy.
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Joined: May 2004
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From: Lakewood, Ohio
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Joined: Nov 2002
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From: Concord, NC
I just did the same replacement on my truck. I flushed the entire system to get new brake fluid all the way around. It took a while to get fluid coming out of the rear bleeders on my truck too. How much pedal are you giving it? You may have to adjust the pushrod between the power booster and the master cylinder too, but you should still be able to pump enough to get fluid out the rears. If your truck is just rear abs, there's nothing special that needs to be done, other than bleeding the abs valve on the frame rail under the drivers feet. Start with the right rear, open the bleeder a few turns, and just slowly pump the pedal until fluid starts coming out. Then work your way from longest line (right rear) to shortest, left front doing this, and then go around and pressure bleed in the same order. After all the wheels are bled, bleed the abs valve, and you should be set.
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Thread Starter
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Senior User
Joined: Jun 2004
Posts: 205
Likes: 0
From: Florida
I will try swapping the bleeder screws. I noticed they are packed with dirt, since the wheel cylinders are original. Dont know why my profile said 2006, but I corrected it. Its a 1990 F-150 5.0L. Ill give it a try first thing and post what I find out.
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Senior User
Joined: Jun 2004
Posts: 205
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From: Florida
Well, got it all fixed. Seems the bleeder screws had clogged up. Looked clean on the outside but after taking them out and taking the drum off and pumping the brake i was able to get them to bleed.