Is this the way to bleed brakes?
02-12-2002, 06:23 AM
#1
Racer
Thread Starter
Is this the way to bleed brakes?
I want to bleed the brakes on my 911 Turbo 1991.
The brakefluid was replaced by a Porsche Center in september. After a track event in oktober I overheated the brakes and now have air in the brakefluid. I now want to change the brakefluid in the calipers.
Can I bleeding the brakes (after bleeding off the pressure) by hooking up a power bleeder to the brake reservoir, attaching a hose and opening each bleeder nipple?
What can I destroy by doing it in this way(without the hammer)?
Or do you all recommend that I take the car to Porsche Center and have them change the brakefluid?
/Patrik
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Bill Gregory writes:
Courtesy of the factory manual, maybe this will help:
"Since brake master cylinder circuits, consisting of the push rod circuit (for front axle) and intermediate piston circuit (for rear axle) with the ABS hydraulic unit, are completely independant of the booster circuit (brake booster and lock control), brake fluid replacing and bleeding procedures are divided into different jobs."
"The brake fluid change is subdivided into two steps:
1st step: Change brake fluid of the brake master-cylinder circuits and clutch hydraulics (conventional). Also valid for bleeding of the brake master-cylinder circuits and clutch hydraulics.
2nd step: Change the brake fluid of the booster circuit (brake booster and lock control). Operate the lock solenoid valve with the system tester 9288 and remove brake fluid at each lock cylinder"
Bleeding the brakes by hooking up a power bleeder to the brake reservoir, attaching a hose and opening each bleeder nipple, accomplishes the first step only.
The brakefluid was replaced by a Porsche Center in september. After a track event in oktober I overheated the brakes and now have air in the brakefluid. I now want to change the brakefluid in the calipers.
Can I bleeding the brakes (after bleeding off the pressure) by hooking up a power bleeder to the brake reservoir, attaching a hose and opening each bleeder nipple?
What can I destroy by doing it in this way(without the hammer)?
Or do you all recommend that I take the car to Porsche Center and have them change the brakefluid?
/Patrik
<a href="http://forums.rennlist.com/scripts/rennforums/ultimatebb.cgi?ubb=get_topic&f=4&t=000864" target="_blank">http://forums.rennlist.com/scripts/rennforums/ultimatebb.cgi?ubb=get_topic&f=4&t=000864</a>
Bill Gregory writes:
Courtesy of the factory manual, maybe this will help:
"Since brake master cylinder circuits, consisting of the push rod circuit (for front axle) and intermediate piston circuit (for rear axle) with the ABS hydraulic unit, are completely independant of the booster circuit (brake booster and lock control), brake fluid replacing and bleeding procedures are divided into different jobs."
"The brake fluid change is subdivided into two steps:
1st step: Change brake fluid of the brake master-cylinder circuits and clutch hydraulics (conventional). Also valid for bleeding of the brake master-cylinder circuits and clutch hydraulics.
2nd step: Change the brake fluid of the booster circuit (brake booster and lock control). Operate the lock solenoid valve with the system tester 9288 and remove brake fluid at each lock cylinder"
Bleeding the brakes by hooking up a power bleeder to the brake reservoir, attaching a hose and opening each bleeder nipple, accomplishes the first step only.
02-12-2002, 11:13 AM
#2
Patrick, you don't need the hammer for the turbo. Just a pressure bleeder (or vacuum...but pressure would be much easier).
If you have a fax, I can send you the instructions.
If you have a fax, I can send you the instructions.
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02-22-2002, 09:34 PM
#8
Rennlist Member
I thought if you wanted to be thorough in your bleeding job that you needed to cycle the antilock brake circuit with the "hammer" to bleed the ABS solenoid valves. Is this not true? <img src="graemlins/burnout.gif" border="0" alt="[burnout]" />
