Brake problem
Thread Starter
Heel & Toe
Joined: Feb 2017
Posts: 19
Likes: 0
Brake problem
Hi,
I have a problem in the brake on my corvette base 2008
I installed new rotors, new pads, new master brake cylinder.
but continues with the problem
I preload the brake pedal, but my car does not stop.
the pedal does not go to the bottom (basement)
the brake is bad
what's the problem?
ABS modulator valve?
sorry my bad english
I have a problem in the brake on my corvette base 2008
I installed new rotors, new pads, new master brake cylinder.
but continues with the problem
I preload the brake pedal, but my car does not stop.
the pedal does not go to the bottom (basement)
the brake is bad
what's the problem?
ABS modulator valve?
sorry my bad english
Race Director
Joined: Dec 2002
Posts: 10,452
Likes: 1,146
From: Wayne Township WI
By replacing MC, system needs to be vigorously bled to get all air out of lines. Did you bleed? If yes sure it was enough to get all air out? 
Let's see, by 'preload' you mean depress brake pedal?
If so, does pedal feel spongy?
A spongy pedal's first sign air's present.
Bleeding system, thoroughly, brakes should be golden.
I preload the brake pedal, but my car does not stop.
If so, does pedal feel spongy?
A spongy pedal's first sign air's present.
Bleeding system, thoroughly, brakes should be golden.
Last edited by Landru; Mar 26, 2018 at 05:29 PM.
Race Director
Joined: Dec 2013
Posts: 12,501
Likes: 3,627
You have air in the ABS module, or better yet, in the ABS pump.
So your going to need to use a Tech II to do the automated brake bleed process to get the air out of the abs pump and abs valves by cycling the pump and valves.
So a 2008 with Tech II tool connected to the car.
On the tech II tool,
F0 diagnostics, enter
Passenger car, enter
Chevrolet, enter
Y, enter
F2 chassis, enter
F0 electronic brake control module, enter
F2 special functions, enter
F0 Automated bleed, enter
From here, the tool will walk you threw the process of bleeding the brakes, as well the ABS unit per caliper to cycle the air out of the abs pump and valves as well.
Hence you will start with the back passenger caliper, open the bleed valve with hose can catch bottle, pump the pedal slowly a few times, the tool will then tell you to stop pumping the pedal, you will hit next on the tool so the tool cycles the ABS pump and valves for a few seconds, the tool will tell you to close the caliper bleeder valve, then move you onto the next caliper to do the same, and so on; being passenger rear, then driver rear, then passenger front, ending with drivers front.
As for doing a power bleed on the system every few years, use the Tech II as well.
Hence start with draining the reserve tank and filling it with fresh fluid, do a powder bleed on the rear passenger caliper to get flush fluid all the way to the ABS pump, do the Tech II automated bleed process to get the older fluid out of the abs pump and valves, then go back and power flush the calipers like normal to get the remaining old fluid out of the lines in the end.
To add, if you are going to wrench on the car yourself, you are going to need a Tech II tool.
A clone Tech II will run you about $250, while if you have a laptop and somewhat computer savvy, a XV gm nano will run you about $119 instead. If all your going to use the tool for it just the C6, then Tech II clone maybe the better option, but the VX GM nano is a MDI clone; so it works both on older cars like the the C6 running tech2 win to work as a Tech II, as well as a MDI running GDS2 for the C7 and newer GM model cars.
So your going to need to use a Tech II to do the automated brake bleed process to get the air out of the abs pump and abs valves by cycling the pump and valves.
So a 2008 with Tech II tool connected to the car.
On the tech II tool,
F0 diagnostics, enter
Passenger car, enter
Chevrolet, enter
Y, enter
F2 chassis, enter
F0 electronic brake control module, enter
F2 special functions, enter
F0 Automated bleed, enter
From here, the tool will walk you threw the process of bleeding the brakes, as well the ABS unit per caliper to cycle the air out of the abs pump and valves as well.
Hence you will start with the back passenger caliper, open the bleed valve with hose can catch bottle, pump the pedal slowly a few times, the tool will then tell you to stop pumping the pedal, you will hit next on the tool so the tool cycles the ABS pump and valves for a few seconds, the tool will tell you to close the caliper bleeder valve, then move you onto the next caliper to do the same, and so on; being passenger rear, then driver rear, then passenger front, ending with drivers front.
As for doing a power bleed on the system every few years, use the Tech II as well.
Hence start with draining the reserve tank and filling it with fresh fluid, do a powder bleed on the rear passenger caliper to get flush fluid all the way to the ABS pump, do the Tech II automated bleed process to get the older fluid out of the abs pump and valves, then go back and power flush the calipers like normal to get the remaining old fluid out of the lines in the end.
To add, if you are going to wrench on the car yourself, you are going to need a Tech II tool.
A clone Tech II will run you about $250, while if you have a laptop and somewhat computer savvy, a XV gm nano will run you about $119 instead. If all your going to use the tool for it just the C6, then Tech II clone maybe the better option, but the VX GM nano is a MDI clone; so it works both on older cars like the the C6 running tech2 win to work as a Tech II, as well as a MDI running GDS2 for the C7 and newer GM model cars.
Last edited by Dano523; Mar 26, 2018 at 06:27 PM.
Race Director
Joined: Aug 2008
Posts: 14,071
Likes: 1,589
From: Edmond Oklahoma
Check if the vacuum connector to the booster is installed the right direction. If it is reversed you will have no brake at all. Happened to me once, if you had it out of the line it could be backwards.
