Brake issues - Chevrolet Forum - Chevy Enthusiasts Forums

Brake issues


  Reply  
Lisa N Greg Highsmith's Avatar
CF Beginner

Join Date: Feb 2017
Posts: 3

February 25th, 2017, 1:44 PM   #1  
Brake issues

I just bought a 1994 blazer and am having some issues with the brakes. When I first apply the brakes for normal stopping it will jerk to the left extremely hard but after a split second it will straighten out and come to smooth stop. The person I bought it from just replace both front calipers and pads. The brake pedal feels real squishy like it is air in the lines. I flushed the fluid and bled the brakes and the problem persists. I pulled the brake hose off of the right side and tried putting a new one it but since it has 8 inches of lift I found out I have to special order a new one. I blew through the old one and had plenty of air passing through it so not sure if the hose is bad or not and it is a steel braided hose so I heard they do not go bad often. When I bled the lines I had plenty of pressure on all of the lines except the right front line and had very little on that one. So I am guessing it is blockage in the metal line from the master cylinder to the brake hose. My question is where to look if the new metal line and hose does not fix it when I get it in. I wouldn't think it would be the master cylinder since all of the other brakes are working fine.


Last edited by Lisa N Greg Highsmith; February 25th, 2017 at 1:51 PM.
 
tech2's Avatar
CF Monarch

Join Date: Mar 2011
Posts: 5,095

February 26th, 2017, 9:37 AM   #2  
if the new flex hoses do not change anything...do a suspension check and make sure there is no play in the ball joints, steering linkage, control arm bushings. any play will cause a directional change when you brake.

 
Lisa N Greg Highsmith's Avatar
CF Beginner

Join Date: Feb 2017
Posts: 3

March 5th, 2017, 7:12 PM   #3  
So I have traced the blockage to this but I am not sure what it is. I thought it was an ABS control modulator but when I look that up to see how much it costs it comes up with something different. Can anyone tell me for sure what the name of this is. I know that when i break the lines loose going into it from the master cylinder I get plenty of fluid pressure but when I break the line loose going from this box the right front brake caliper I get very little fluid pressure at all.

 
tech2's Avatar
CF Monarch

Join Date: Mar 2011
Posts: 5,095

March 7th, 2017, 8:53 PM   #4  
its the electronic brake control module and brake pressure modulator valve...also known as the abs module and pump.

any abs codes?
so when you check the l/f outlet from the pump, its good?

 
Lisa N Greg Highsmith's Avatar
CF Beginner

Join Date: Feb 2017
Posts: 3

March 10th, 2017, 1:15 PM   #5  
Yes so I checked the line coming out of the master cylinder going to that electronic brake control module and had plenty of fluid and then checked the line coming out the electronic brake control module going to my caliper and had very little fluid coming out.
No codes at all

 
tech2's Avatar
CF Monarch

Join Date: Mar 2011
Posts: 5,095

March 11th, 2017, 11:34 PM   #6  
with a scan tool, do a abs pump autobleed procedure

 
Search this Thread
Sponsors
Sponsors
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: