View Full Version : bad braking after adjustable proportioning valve => HELP!


Markus
Sep 4th, 06, 12:20 PM
Hello!

It's a little bit difficult to describe for me on english, but I will try.

I own a 69' Camaro with original front disc brakes and rear drum brakes. No proportioning valve for the drums (why?).

My new setup:

I installed one ajustable proprtioning valve for the front disc and aone for the rear drums, because i want to install discs at the rear next year.
I didn't install the metering valve (the valve in the lines for the FRONT brakes) and the pressure differnetial warning any more.
New situation:
I have no "hard point for braking" when I depress the brake pedal. It is soft for a way of 2", then there's a pressure built up, but a poor braking performance.

From a speed of approx 30 mph the front brakes not lock up.

First question: Is this setup ok or should I have to install the other valves again?

One more problem:

On the left front side the bleeding screw at the brake caliber is broken.

So I have to deinstall the caliber, loosen the brake hose for bleeding. This is not a very good way but I don't know something better. Ok, installing a new one will be the best. Perhaps there's still air in the front lines.

I will try to do a better bleeding, but I also want to know if the technical setup => One adjustable proportioning valve for thr front and one for the rear without any others should work!

BlackoutSteve
Sep 4th, 06, 01:22 PM
Regardless of your braking bias or valves installed, if your pedal is soft, air will be in the system or maybe you have a leak.
Check for leaks and bleed your system. Braking bias may also improve with this.

JimM
Sep 4th, 06, 04:46 PM
you do NOT want a proportioning valve in front at all.
The valve reduces the pressure and you always want full pressure to the front brakes.

Use the adjustable rear proportioning valve to balance the system so the rear brakes do NOT lock up first, that's all.

davidpozzi
Sep 4th, 06, 11:14 PM
No valves in the front lines, remove the caliper and take it to a machine shop and have the broken bleeder removed. You should be able to find a replacement bleeder screw.

Some camaros have a proportioning valve on the frame rail under the driver's legs. Take a look there.
http://www.pozziracing.com/Media/prop_location.jpg

David