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I am having problems with the brakes on my 67 Shelby 350. Upon braking the rear wheels want to lock up. I have rebuilt the porporting valve, distrobution box, new master cylinder, new rotors,front brakes,rear brakes. A check of pressure shows 800 lbs in rear and 900 lbs in front. Any ideas out there?
 

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Have you adjusted the proportioning valve? Sounds like the pressure difference is ther, but too low. disc brakes require more pressure to 'clamp' the rotor. Check the shop manual for adjusting the prop valve.

Or, perform a manual adjustment.
Turn the valve one way, have a friend watch you and brake on an empty parking lot, Repeat procedure until all 4 wheels lock up. The only thing wrong with this method is I don't know which way to turn the valve, I would have to do some more research on this.

Good luck and keep us posted...


Steve Leslie, 65 coupe in restoration. 302, toploader, A/C, disc brakes, bench seat
 
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