Need some brake help
Thread Starter
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Junior User
Joined: Mar 2013
Posts: 51
Likes: 0
From: sedona az
Need some brake help
I'm have very little brake pedal, no brakes till pedal is about 90% down
I installed a new master cylinder (old one blew a seal)
New rear wheel cylinders, hardware, shoes and turned drums.
All brakes are adjusted
I bled master cylinder and all wheels
I'm stumped
75 f250 Highboy 4x4
Front and rear drum brakes
I installed a new master cylinder (old one blew a seal)
New rear wheel cylinders, hardware, shoes and turned drums.
All brakes are adjusted
I bled master cylinder and all wheels
I'm stumped
75 f250 Highboy 4x4
Front and rear drum brakes
Lead Driver
Joined: Oct 2018
Posts: 7,847
Likes: 2,353
Does the pedal return to the normal height ? sometimes you have to adjust the length of the rod to fit a new MC.
If that's not it you probably still have air in the system. it can be a real SOB to get everything bled sometimes.
If that's not it you probably still have air in the system. it can be a real SOB to get everything bled sometimes.
Thread Starter
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Junior User
Joined: Mar 2013
Posts: 51
Likes: 0
From: sedona az
I will look at the rod length
I vacuum bled it and used the pedal
Grumpy goat
Joined: May 2017
Posts: 3,058
Likes: 594
If your master cylinder is bled, and everything else mentioned is right, I'd suspect the proportioning valve. Best brake modification I've done is bypass/delete the proportioning valve and installed adjustable valve on rear brake line only.
Laughing Gas
Joined: Feb 2011
Posts: 995
Likes: 317
Most likely one of 3 things.
Master cylinder not bench bled
Improperly adjusted or assembled shoes resulting in too much travel before contact with drum. (Try pinching the rear brake hose off with vise grips. Not so tight to damage hose, just enough to block fluid. If you get better pedal problem is with rear brakes)
Master cylinder is defective and fluid is passing by the piston seals
Master cylinder not bench bled
Improperly adjusted or assembled shoes resulting in too much travel before contact with drum. (Try pinching the rear brake hose off with vise grips. Not so tight to damage hose, just enough to block fluid. If you get better pedal problem is with rear brakes)
Master cylinder is defective and fluid is passing by the piston seals
Elder User
Joined: Nov 2003
Posts: 778
Likes: 2
From: southeast Idaho
The last thing mentioned above is becoming quite common anymore, new in no way guarantees a good product at all..
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Laughing Gas
Joined: Apr 2018
Posts: 1,244
Likes: 12
I swore there was something wrong with my new master cylinder or my install until I went through and bled everything a second time. That's the easiest place to start and might solve your problem.
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