Pedal 2 floor ?

[1981lemans455]

So is this the Wilwood proportioning valve with the adjustable knob for the rear brake bias? And if so have you gone through the adjustments with this prior to doing anything else.

Yes, it has the adjustment knob. There were no instructions on how to adjust , so I don't know what to do with it .

 

[565bbchevy]

I would try and adjust the pressure to the rear brakes with the knob first before you change anything else, I believe the valve can reduce pressure to the rear brakes up to 57% so I would go to Wilwood's site to get the adjustment instructions for your part number.

 

[jeremyandthemonte]

this might not be correct or your situation but it does give you a idea how to adjust the valve at around the 13 minute mark

 

[malibudave]

Do your rear calipers have a built in parking brake? If so, these types of brake calipers need to be adjusted. I believe the way to do this is to actuate the parking brake a few time to ratchet the pads closer to the rotor. This will take up the excess play the pads have. I don't think it is your front calipers and I wouldn't put a higher psi residual valve in the rear line. 2lb is the max I would use.

Clamp off your rear brake line. If you get a better pedal, it is your rear calipers that are giving you fits.

 

[1981lemans455]

So I clamped all 3 brake hoses. Pedal is hard ! No movement ! I let off the LT front clamped hose and pedal is still hard, then I let off the RT front clamped hose, very little movement, pedal still hard ! Then I let off the rear clamped hose.. Bammmm , pedal right to the floor! So the problem is in the rear ! .? The park brake holds good ! And to recap, the rear system has a 2LB pressure valve from summit racing? It seems to have a lot of wiggle room in the pads when the brake is off ? Do I need a stronger valve ?? 10 Lbs ?

 

[1981lemans455]

So I clamped all 3 brake hoses. Pedal is hard ! No movement ! I let off the LT front clamped hose and pedal is still hard, then I let off the RT front clamped hose, very little movement, pedal still hard ! Then I let off the rear clamped hose.. Bammmm , pedal right to the floor! So the problem is in the rear ! .? The park brake holds good ! And to recap, the rear system has a 2LB pressure valve from summit racing? It seems to have a lot of wiggle room in the pads when the brake is off ? Do I need a stronger valve ?? 10 Lbs ?

 

[pontiacgp]

not 10 lbs, 10 lbs is for a drum brake to restrict the springs pulling back the shoes if you tried that the pad would be rubbing hard on the rotors. I would try a new 2lbs pressure valve.

 

[manualbrakes.com]

Do I need a stronger valve ?? 10 Lbs ?

10lb residual valve is for drum brakes and will be too much for front or rear disc brakes. You need to adjust the rear pistons out toward the rotors if there is side to side movement in your pads. I think pulling and releasing the parking brake a few time "SHOULD" do the trick. I would call the company you bought them from and see if they have any additional insight on how to adjust them.

 

[pontiacgp]

Have you checked to make sure there is no air in the rear lines?

 

[1981lemans455]

10lb residual valve is for drum brakes and will be too much for front or rear disc brakes. You need to adjust the rear pistons out toward the rotors if there is side to side movement in your pads. I think pulling and releasing the parking brake a few time "SHOULD" do the trick. I would call the company you bought them from and see if they have any additional insight on how to adjust them.

I have cycled the park brake many times, hopeing to get the piston tight against the pads. If the park brake applies hard, and the hydraulic brakes hold when pumped, seems to me that I need the slack taken up. caliper pistons are retracting too much ?