Please help! - no brakes

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Aug 11, 2010 | 04:33 PM

Byrd.Dog

Thread Starter

Laughing Gas

Joined: Aug 2010

Posts: 1,049

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From: Amarillo, TX

Please help! - no brakes

I've gor a 60 F250 4x4. I just had a blown seal in the master clyinder (had fluid leaking onto the floorboard under the brake pedal), so I bought a rebuild kit for it. Replaced the rubber seal that sits on the large end of the spring and the plunger(?). hooked everything back up & bled brakes, and still nothing. Pedal has resistance on it, but goes all the way to the floor every time I push it. Seems like maybe there's not a good seal inside the master cylinder? FYI - the kit also came with a new strainer-looking piece, but I re-used the origional because the new one looked a little different. Any ideas would be greatly appreciated.

Aug 11, 2010 | 04:39 PM

whateg01

More Turbo

Joined: Jan 2007

Posts: 593

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From: Wichita, KS

If it's leaking you should be getting fluid on the ground or somewhere. Could be a bad hose somewhere ballooning when you press the pedal. Can you remove a line from the master cylinder and see if it forces fluid out?

I guess those are just some generic tips.

Dave

Aug 11, 2010 | 04:44 PM

Byrd.Dog

Thread Starter

Laughing Gas

Joined: Aug 2010

Posts: 1,049

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From: Amarillo, TX

No, not leaking anywhere, just brakes don't work. Gonna try plugging the outlet from the master cylinder to see if the pedal remains spongy.

Aug 11, 2010 | 05:09 PM

mechmagcn

Logistics Pro

Joined: Dec 2005

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From: Moro Bay, AR

Sounds like the master cylinder is bypassing internally, you did put the seal on the piston the correct way? the lip goes toward the spring.

Aug 11, 2010 | 06:27 PM

Byrd.Dog

Thread Starter

Laughing Gas

Joined: Aug 2010

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From: Amarillo, TX

Got it! Just had to bleed the brakes A LOT more. Not working great, but just as well as before the master cylinder went out. Thanks for the ideas guys.

Aug 11, 2010 | 07:14 PM

52 Merc

Hotshot

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From: Burbank, WA

Did you bench-bleed the master cylinder before you installed it? Not doing so will create all sorts of never-ending brake issues.

Aug 11, 2010 | 11:24 PM

tardster

Elder User

Joined: Oct 2004

Posts: 813

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From: Auburn, Il

Quote:

Originally Posted by Byrd.Dog

Got it! Just had to bleed the brakes A LOT more. Not working great, but just as well as before the master cylinder went out. Thanks for the ideas guys.

After I did my disk brake conversion, I got mine bled just enuff to stop me. Then I took it to the local NAPA here and had them go through the system to double check it to make sure I didn't miss anything and had them replace the rear wheel cylinders and bleed the brakes. It cost less than 70 bucks so it was worth it...