Brakes "Auto Bleed" procedure - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-21-2006, 05:09 PM   #1
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Default Brakes "Auto Bleed" procedure

The vehicle is 1995 Bonneville SSEi.
After changing brake pads I noticed when start braking the pedal is too soft and it'* better braking second time after pupmp it once .The guys at shop didn't bleed the brakes or even open master cylinder when changing pads. There are no visible leaks.
CHILTON repair manual states " ..for 1994-1999 vehicles with ABS ,after bleeding the brake system you must perform an "Auto Bleed" sequence ,using a Tech1 or equivalent scan tool. If you don't have access to a suitable scan tool,your vehicle will probably have to be towed to a shop with the proper diagnostic equipment to have the procedure performed".
Any body knows what'* is it all about this "Autobleed" procedure and if this is a must?

Thank you in advance.
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Old 12-21-2006, 05:13 PM   #2
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I haven't heard of this procedure and have always just bled my brakes like one normally would. Seems to work fine.

Anyone else heard of it?

BTW the title made me laugh...my eyes were bleeding... :P
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Old 12-21-2006, 05:17 PM   #3
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LOL I will change it.
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Old 12-21-2006, 05:58 PM   #4
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Wow. I agree with whip boy. Just bleed them normally starting with the bleeder farthest from the reservoir - i.e., RR, LR, RF, LF. Now, if someone was messing with the ABS stuff, you might have a reason for concern, otherwise, nah.

Unless the fluid has been flushed lately, before you start bleeding, you might want to suck the old fluid out of the reservoir with a turkey baster and discard it, replacing it with fresh fluid. Don't touch the pedal with the reservoir empty, though, or you will introduce air into the master cylinder.
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Old 12-22-2006, 07:44 AM   #5
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In some vehicles it'* possible to use the ABS pump to bleed the system.

I don't think you need to worry. The first rule of changing brakes is pump them up before putting the car in gear. When you change the brakes, you push the fuild back to the master cylinder and empty most of the caliper. Therefore the caliper must be refilled and that can take a couple of pumps.

You should be all set (right?)
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Old 12-22-2006, 05:56 PM   #6
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Thanks all for replying.
BilliBoost,I tried pumping it at diff stages before driving.It still needs bleeding I think.(too soft)
I may visit (or call) one of those GM service advisers and ask what they know about
this procedure.I have feeling some of them will have no idea what I'm asking about.

Anyway thanks again.

Regards
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Old 12-23-2006, 10:11 PM   #7
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The autobleed engages the ABS valves so that it can get the air bled out of it also.
Since you only had the pads changed, no air should have gotten into your system and you really shouldn't have need of this procedure.
Merry Christmas,
Tim
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