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Username Post: How do you reset proportioning valve        (Topic#369878)
Junk86 
Newbie
Posts: 38

Reg: 03-15-19
10-26-22 07:53 PM - Post#2849114    

How do you reset the proportioning valve on a 1986 Camaro? Front Disc and rear drum brakes.



 


Shepherd 
Valued Contributor
Posts: 2750

Loc: Lake George, NY
Reg: 11-11-15
10-27-22 04:27 AM - Post#2849119    
    In response to Junk86

Plenty of Utube info. You can remove the brake lite warning switch and center it with a test lite probe, it's a little tricky. There is a dummy switch that can be inserted in that port to keep it centered while bleeding. Also easy to get on Ebay.



 
damnyankee36 
Member
Posts: 118
damnyankee36
Reg: 04-16-03
11-03-22 09:27 AM - Post#2849550    
    In response to Shepherd

Another way is to open a bleeder on either the front or rear system and slowly press the pedal until the light goes off.

You have a 50/50 shot at choosing the correct system.



 
Junk86 
Newbie
Posts: 38

Reg: 03-15-19
11-10-22 04:56 PM - Post#2849915    
    In response to damnyankee36

Watched all the videos, even used the bleeder tool to keep the PV centered, but it somehow is still not centered. Have a soft brake pedal when applying the brakes. Did gravity bleed and got a lot of fluid out of the rear bleeders, got fluid to flow from RF bleeder, but nothing from the LF bleeder. When I bleed the brakes, I got some fluid out of the LF but not as much as the RF. I suspect the valve has been pushed to the rear brake side. Which bleeder should I open first, one of the front or one of the rear bleeders?



 
Junk86 
Newbie
Posts: 38

Reg: 03-15-19
11-11-22 04:37 AM - Post#2849931    
    In response to Shepherd

Did manage to get the brake light warning light out, by using a test probe. I'll know today if it's recentered after I take it for a test drive. If the light does not come back on, I guess I got it right. Will keep to all informed.



 
Junk86 
Newbie
Posts: 38

Reg: 03-15-19
11-11-22 09:41 AM - Post#2849943    
    In response to Junk86

The brake warning light is now out, but spongy soft pedal still present. Replaced the brake booster check valve made no difference. I am now convinced that I have more trapped air in the system. Will address that issue when the rain stops. I am also going to readjust the rear brakes. That also could be part of the problem. All the brake hoses, master cylinder and brake lines and PV were all replaced, which created this problem.
Junkyd86




Edited by Junk86 on 11-11-22 09:44 AM. Reason for edit: No reason given.

 
Shepherd 
Valued Contributor
Posts: 2750

Loc: Lake George, NY
Reg: 11-11-15
11-11-22 11:44 AM - Post#2849957    
    In response to Junk86

Seen this many times, careful during bleeding you don't open the bleeder too far, you will not fully purge that line. Also that shuttle valve must be centered to get a full bleed out of the back or front.



 
bobb 
Super Senior Member
Posts: 6180

Loc: paradise
Reg: 09-05-03
11-11-22 10:16 PM - Post#2849975    
    In response to Junk86

uh, stomp the peddle.

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
Tony1963 
Frequent Contributor
Posts: 1776

Loc: Orlando Florida
Reg: 07-09-18
11-20-22 03:00 PM - Post#2850293    
    In response to Junk86

With pressures in balance, the proportioning valve will center itself.

I realize that all of this can be frustrating, but you have air somewhere in the system.

I am a fan of vacuum bleeding the brakes which is really pressure bleeding as atmospheric pressure is around 14.7 lbs.

People fear change because it threatens what they know, or what they claim to know.


Edited by Tony1963 on 11-20-22 03:02 PM. Reason for edit: No reason given.

 
paulo57509 
Senior Member
Posts: 564

Loc: CA
Reg: 07-18-00
11-20-22 06:58 PM - Post#2850301    
    In response to Tony1963

Third Gens have awful brakes to begin with, the disc/drum combo is a little better for some reason.

Was the master cylinder ever run low/dry? If you suspect air in the system, try starting at the MC.

1987 IROC-Z 5.0L
1992 Lumina Euro 3.1L
2003 GMC Safari


 


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