Has anyone tried replacing the spring in the proportioning valve to make the rear brakes work better? I just read a thread on a professional auto tech subscription web site. The thread stated that the performance of the rear brakes was greatly increased by replacing the proportioning valve spring with the heavier one out of a 1993-1996 Caprice. The person in the thread said they had used one out of a 91 Caprice and it was a little stiff and didn't fit well on the springs nub, but the rear brakes worked much better. In fact, he thought the spring was too stiff as the rear brakes locked-up. Maybe with a little experimentation we could find an ideal spring in the JY. Thoughts?

 

I'd rather just replace the whole valve with an aftermarket adjustable one. That way you can adjust it until you get the ideal front/rear bias. Not all cars act the same with the same level of front/rear pressure differential. Tire size, weight, and other factors can affect the point at which the rear tires lockup vs the fronts. This is why I'd rather run an adjustable valve that doesn't require me to take the valve apart every time I want to make a change. Brake fluid does funny things to your skin...

 

It does a fine job removing paint also. While I agree with the dymanics changing due to many factors, I worry about the safety of the aftermarket proportioning valves. My understaning is that they do not have the shuttle valve to isolate the chambers of the master cylinder. What happens if you blow a hose with an aftermarket valve? I plan on calling Baer to find out on Monday.

An adjustable would be a great situation for me. I could dial up the rear pressure to help build boost on the line and put back to balanced for street driving. Does anyone offer a plug and play valve with per bent flaired lines?

 

https://www.thirdgen.org/techbb2/sho...+valve+braking

this should work.

 

The aftermarket valves are used in all forms of racing, so I would consider then equally as safe as a stock part.

The aftermarket proportioning valve should only be installed in the rear brake line to regulate pressure. You still have the safety margin of the factory valve before it to keep you from losing all braking if something in one end of the system fails.

Even if you didn't you still have the e-brake, assuming it works...