brake question
Thread Starter
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
brake question
I just replaced my brake booster due to an internal vacuum leak, I also have a new master cylinder and Hawk pads all the way around. There is no air in the lines but my pedal goes too far down before it will do any braking. I remember something about adjusting the length of the booster rod that goes into the master cylinder. What exactly is the procedure for this? I can't find anything in the search but it seems I remember something that had to be done just so.
Race Director
Joined: Dec 2006
Posts: 10,383
Likes: 4
IME the only adjustment is washers on the studs. SOP is reuse the same washers if any are present.
I know you bled the brakes but you have to admit that the description still sounds like air in the line. Can you wedge a squeegee or similar between the seat and the brake pedal to hold it down over night and let the pedal up in the morning? (power seat will make it easy) Better results if the bore of the master is level prolly put the rear wheels on some boards will do the trick.
I know you bled the brakes but you have to admit that the description still sounds like air in the line. Can you wedge a squeegee or similar between the seat and the brake pedal to hold it down over night and let the pedal up in the morning? (power seat will make it easy) Better results if the bore of the master is level prolly put the rear wheels on some boards will do the trick.
Thread Starter
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
I seriously doubt the presence of air. The pedal goes to the same point every time, it will not pump up and the brakes are good but I feel they could be better. I usually change out my fluid every 2 years and I do it with a Mityvac and I have never had air. I do appreciate your response though.
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
Thread Starter
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
That's exactly what mine was like. I adjusted the screw out approximately 1/8 to 3/16 inch. The screw itself is an 8mm and there is a knurled collar it screws in to. You have to hold that collar while turning the screw out, I used needle nose pliers because it is kinda close in there. But like 94z07fx3 suggested, be sure you don't have air in your lines first.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Burning Brakes
Joined: Mar 2010
Posts: 1,094
Likes: 68
From: Providence RI
Update...
Adjusted the plunger by about 1/2" and the free play amount at the pedal is down to under an inch...which is better than the 2-3 that I had before.
Not hard to do and definately worth it...No wonder the car didnt stop for ****. Installed a DRM bias spring too so I should be set if this thing ever runs again.
Thanks for your help.
Mike
Adjusted the plunger by about 1/2" and the free play amount at the pedal is down to under an inch...which is better than the 2-3 that I had before.
Not hard to do and definately worth it...No wonder the car didnt stop for ****. Installed a DRM bias spring too so I should be set if this thing ever runs again.
Thanks for your help.
Mike
2nd Gear
Joined: Sep 2006
Posts: 2
Likes: 0
From: Fort Lauderdale Fl.
My situation is a bit strange. The free play height keeps changing. Stays at one level for a while, while I drive, then might be a larger distance after a few stops and then go back to a normal free play length. Was like this before new pads and rotor and then the same after changing and bleeding system. Does not feel spongy as if air were trapped
Thread Starter
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
I think they are, I do know they sure don't put out all that black dust the stock ones did. Just be sure & follow the "bedding" procedure outlined on the box. They definitely work better when they are a bit warm so I just make sure to be careful the first few stops of the day.
