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#1
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brake work on anti-lock brakes
I'm a shade tree mechanic who has done his own brake work for 25+
years. I've always had older cars so I have never worked on one with anti-lock. I've a 99 suburban that probably needs new pads and I might as well replace the fluid. Can I do this work like I always have or are them some gotchas that I need to keep in mind now that anti-lock is part of job? tks don |
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#2
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The commonly replaced parts e.g. shoes, wheel cylinders, pads, calipers are exactly the same with or without ABS. Some parts are different. If you replace a rotor and hub assembly it must have the teeth for the ABS speed sensor. Some people have said that you can not flush brake fluid with ABS without some special procedure or tools, but I have done several just like in the old days without any problems. wrote: > > I'm a shade tree mechanic who has done his own brake work for 25+ > years. I've always had older cars so I have never worked on one with > anti-lock. I've a 99 suburban that probably needs new pads and I might > as well replace the fluid. Can I do this work like I always have or > are them some gotchas that I need to keep in mind now that anti-lock is > part of job? > > tks > don -- Mike Walsh West Palm Beach, Florida, U.S.A. |
#3
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There are a few special instructions.
1) when pressing the pistons back in the calipers, open the bleeder screw so as not to push brake fluid backwards through the system. You don't want to get debris from the calipers back into the ABS control valves. 2) If you are replacing the calipers, pinch off the brake hoses with some plastic hose pinch off tools so as not to let the master cylinder run dry. If any of the circuits run dry, you will have to bleed the ABS control unit which requires the GM scan tool. Likewise, you can run fresh brake fluid through the system, but as Mike says you can't do a traditional flush in the sense of emptying it, flushing with alcohol, and then refilling. 3) If you have to replace the hoses, it might be best to let someone with a scan tool do the job as you will definitely have to bleed the ABS control unit when done. Same thing goes for replacing the master cylinder or proportioning valve. good luck, nate Mike Walsh wrote: > The commonly replaced parts e.g. shoes, wheel cylinders, pads, calipers are exactly the same with or without ABS. Some parts are different. If you replace a rotor and hub assembly it must have the teeth for the ABS speed sensor. Some people have said that you can not flush brake fluid with ABS without some special procedure or tools, but I have done several just like in the old days without any problems. > > wrote: > > > > I'm a shade tree mechanic who has done his own brake work for 25+ > > years. I've always had older cars so I have never worked on one with > > anti-lock. I've a 99 suburban that probably needs new pads and I might > > as well replace the fluid. Can I do this work like I always have or > > are them some gotchas that I need to keep in mind now that anti-lock is > > part of job? > > > > tks > > don > > -- > Mike Walsh > West Palm Beach, Florida, U.S.A. |
#4
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#5
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Nice tip, tegger.
Something else to watch for: damage to wheel speed sensors, particularly when banging around with a hammer... Go ahead, ask me how I know... |
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