83slimer
Well-known member
- Joined
- Apr 9, 2015
- Messages
- 177
- Reaction score
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- Location
- Nova scotia Canada
- My Car
- 1973 sportsroof mustang
Hi All,
Having a hard time with my brakes,
Almost like over boosted braking,
New re manufactured booster , used proportioning valve , all new lines etc. New master cylinder.
Ive bled the lines several times and the pedal feels ok when not running, as soon as I start the engine the pedal gets soft and is very grabby lol when the brakes engage when rolling.
Ive played around with the Push rod length which seems to just engage the brakes sooner when i lengthen the rod.
Master cylinder, I didnt bench bleed it at first, then took it out and bench bled it and didnt notice mutch of a difference before and after.
I have the small bowl of the MC going to the rear brakes part of the proportioning valve. And Large part of the MC to front brakes.
When I push the brakes lightly with MC cover off only the small bowl of the MC squirts fluid up.
The top 3 ports of the pro porting valve are for the front brakes, I have the MC line going into the end port , the one with the brass washer , then left and right ports going to the front calipers, I'm pretty sure thats how it was before I rebuilt my car.
I see with the new proportioning valve from scott drake the diagram shows the MC for the front brakes plummed to the top port the next to the brake fail connector.
Ive read that all 3 ports on the front side share a connection, SO Does it matter where the MC line goes?
I havent tried the new Proportioning valve yet as I have to re-route some lines if I do. I'm not convinced that its the problem but bough a new one just in case.
The brakes seem to bleed fine I get flow out of rear and front when bleeding.
The MC is a Dorman M36445 , Pretty sure its the right one for Disc Drum.
Pic is the way its plumbed now.
Any suggestions?
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