1993 convertible brake bleeding proceedure
Thread Starter
Burning Brakes
Joined: Jun 2003
Posts: 1,079
Likes: 1
From: Niagara Falls ON
1993 convertible brake bleeding proceedure
I searched but couldn't find the answer. I want to find out how to cycle the abs so that I can be sure the brake system is bled completely. Is there a way of jumping pins to do this without the scan tool?
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
To properly bleed the ABS pump itself, a GM Tech-1 scan tool will be needed to run the ABS pump. And the GM Tech-1 needs a special brake module attached to it in order to run the pump. Maybe a SnapOn or MATCO scanner might work?
The pump has it's own bleed valve (IIRC, on the side of the pump body) and it can be a real messy job to do as once you open that bleed valve, brake fluid will simply drain to the bottom of the compartment.
I usually just bleed the brakes at the calipers. Every time the engine is started and the car initially moves forward to about 2-4 MPH, the ABS pump will cycle. That's the buzzing sound you hear behind the seat. That cycling operation moves a small amount of fluid between the pump and master cylinder.
The pump has it's own bleed valve (IIRC, on the side of the pump body) and it can be a real messy job to do as once you open that bleed valve, brake fluid will simply drain to the bottom of the compartment.
I usually just bleed the brakes at the calipers. Every time the engine is started and the car initially moves forward to about 2-4 MPH, the ABS pump will cycle. That's the buzzing sound you hear behind the seat. That cycling operation moves a small amount of fluid between the pump and master cylinder.
Thread Starter
Burning Brakes
Joined: Jun 2003
Posts: 1,079
Likes: 1
From: Niagara Falls ON
Thanks. Had to bleed a system that had been completely replaced. I got the one on the abs unit and used a paper towel beneath it with positive results. Not sure if there is any air in the system still.
Drifting
Joined: Sep 2014
Posts: 1,579
Likes: 59
From: Trieste Italy
To properly bleed the ABS pump itself, a GM Tech-1 scan tool will be needed to run the ABS pump. And the GM Tech-1 needs a special brake module attached to it in order to run the pump. Maybe a SnapOn or MATCO scanner might work?
The pump has it's own bleed valve (IIRC, on the side of the pump body) and it can be a real messy job to do as once you open that bleed valve, brake fluid will simply drain to the bottom of the compartment.
I usually just bleed the brakes at the calipers. Every time the engine is started and the car initially moves forward to about 2-4 MPH, the ABS pump will cycle. That's the buzzing sound you hear behind the seat. That cycling operation moves a small amount of fluid between the pump and master cylinder.
The pump has it's own bleed valve (IIRC, on the side of the pump body) and it can be a real messy job to do as once you open that bleed valve, brake fluid will simply drain to the bottom of the compartment.
I usually just bleed the brakes at the calipers. Every time the engine is started and the car initially moves forward to about 2-4 MPH, the ABS pump will cycle. That's the buzzing sound you hear behind the seat. That cycling operation moves a small amount of fluid between the pump and master cylinder.
So i would assume that all circuit is bleeded, abs too.
Why you say no??
Last edited by Christi@n; Jan 19, 2016 at 04:07 PM.
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
In order to get fresh fluid into the ABS pump as in flushing it, it has to run. That's why a scan tool like the GM Tech-1 with the appropriate brake module has to be connected to the ALDL so that the scan tool can "turn on" the ABS pump. And in flushing the ABS pump, fluid comes out of the pump body at a bleed valve on the side of the unit. It doesn't flow out through the calipers.
Racer
Joined: Dec 2008
Posts: 297
Likes: 19
From: arlington TX
Hi,
Maybe you can cycle the ABS by "getting into the ABS situation"? Find a gravel road and lockup the wheels, making the ABS kick in. Keep an eye on the brake fluid level. A few times ought to get the fluid/air bubbles circulated out of the system. Maybe??
Good luck.
walt z.
Maybe you can cycle the ABS by "getting into the ABS situation"? Find a gravel road and lockup the wheels, making the ABS kick in. Keep an eye on the brake fluid level. A few times ought to get the fluid/air bubbles circulated out of the system. Maybe??
Good luck.
walt z.
Thread Starter
Burning Brakes
Joined: Jun 2003
Posts: 1,079
Likes: 1
From: Niagara Falls ON
Easy to do but not desirable...tons of snow here right now.
Hi,
Maybe you can cycle the ABS by "getting into the ABS situation"? Find a gravel road and lockup the wheels, making the ABS kick in. Keep an eye on the brake fluid level. A few times ought to get the fluid/air bubbles circulated out of the system. Maybe??
Good luck.
walt z.
Maybe you can cycle the ABS by "getting into the ABS situation"? Find a gravel road and lockup the wheels, making the ABS kick in. Keep an eye on the brake fluid level. A few times ought to get the fluid/air bubbles circulated out of the system. Maybe??
Good luck.
walt z.
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