85 firebird brakes

Tim B · 04-30-2010, 07:51 PM

I'm changing my brakes on my 85 firebird to manual brakes from power. Does the proportioning valve have to be changed also? thanks in advance Tim.

Billy Nees · 05-01-2010, 06:15 AM

There is no "proportioning valve" in your 85 Firebird. What you are seeing is a "check" valve that will flip one way or the other if your front or rear brakes fail. Leave it there. Make sure that you get your pedal ratio close to correct!

Tom keedle · 05-01-2010, 06:50 AM

Quote:

Originally Posted by Billy Nees

There is no "proportioning valve" in your 85 Firebird. What you are seeing is a "check" valve that will flip one way or the other if your front or rear brakes fail. Leave it there. Make sure that you get your pedal ratio close to correct!

actually, it's called a combination valve and it does both...
but no, you don't have to change it (unless you're changing the rears to disc)

Tim B · 05-01-2010, 07:33 AM

I have a Ed Quay master cyl, I sent the pedal to them to do the fab work on the pedal so I'm pretty sure that is correct. the problem I'm having is after I pump up the brake's and let them go it seem's to be sucking air back thru the plastic valve and putting air in the back resivoir.the rear brake's are aerospace disc but they were on the car when the power booster was on it and they worked great.

04-30-2010, 07:51 PM	#1
Tim B Junior Member Join Date: Jun 2007 Posts: 76 Likes: 3 Liked 0 Times in 0 Posts	85 firebird brakes I'm changing my brakes on my 85 firebird to manual brakes from power. Does the proportioning valve have to be changed also? thanks in advance Tim. __________________ Tim Blount S/C Q/R 310T

05-01-2010, 06:15 AM	#2
Billy Nees VIP Member Join Date: Oct 2002 Location: On a hilltop in Pa. Posts: 4,493 Likes: 3,595 Liked 7,710 Times in 1,738 Posts	Re: 85 firebird brakes There is no "proportioning valve" in your 85 Firebird. What you are seeing is a "check" valve that will flip one way or the other if your front or rear brakes fail. Leave it there. Make sure that you get your pedal ratio close to correct! __________________ Billy Nees 1188 STK, SS I'm not spending 100K to win 2K

05-01-2010, 07:33 AM	#4
Tim B Junior Member Join Date: Jun 2007 Posts: 76 Likes: 3 Liked 0 Times in 0 Posts	Re: 85 firebird brakes I have a Ed Quay master cyl, I sent the pedal to them to do the fab work on the pedal so I'm pretty sure that is correct. the problem I'm having is after I pump up the brake's and let them go it seem's to be sucking air back thru the plastic valve and putting air in the back resivoir.the rear brake's are aerospace disc but they were on the car when the power booster was on it and they worked great. __________________ Tim Blount S/C Q/R 310T Last edited by Tim B; 05-01-2010 at 07:36 AM.