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Re: Bleeding brakes.. Posted by Walt [Email]  (#2707) [Profile/Gallery]
(more from Walt) on Mon, 31 Oct 2005 06:26:26
In Reply to: Re: Bleeding brakes.. problem.., John Roberts, Sun, 30 Oct 2005 22:30:47 Members do not see ads below this line. - Help Keep This Site Online - Signup |
If non-ABS (prior to 1990) it may be helpful to bench bleed master cylinder before bleeding wheel cylinders. If you want to try this, disconnect brake lines at MC, then remove MC at vacuum servo. Be careful not to allow first piston to slide out of MC when you have it removed. Attach two 9-inch PVC tubes at MC brake line outlets and route them back into top of reservoir. PVC tubes can be purchased at most hardware stores of correct outer diameter that will screw right into brake line outlets. Then put fluid in reservoir so that it covers the PVC lines. Using a screwdriver, press MC piston in and out slowly. Turn the MC so that the brake outlets are facing up to enable bubbles to rise out. After a few squeezes PVC lines will no longer have any bubbles. Leaving PVC lines installed, reattach MC to servo. Then remove PVC lines one at a time and plug brake fittings back in. Then go and bleed at the wheel cylinders. If you have ABS, then skip bench bleeding. Just bleed right (passenger) front wheel cylinder, then left front wheel cylinder with ignition off. Then turn on ignition until ABS light extinguishes (not over 2 minutes). Then bleed rear wheel cylinders. You'll probably have to let ABS pump to run once for each rear wheel. During bleeding of conventional or ABS systems, keep an eye on reservoir fluid level, filling it up as needed. Clutch is a different process. Many different methods have been suggested on SaabNet. You can pressure bleed from a cap attached to brake reservoir to get all the crud out of clutch slave cylinder. Then you have to force bubbles out of clutch MC by pushing fluid in a clutch slave (reverse bleeding) using a large bore syringe (100mL or so). A couple gentle taps on clutch pedal while reverse bleeding expells the last bubbles from clutch MC. Then clutch pedal should be nice and hard. Flushing hydraulic fluid should be done every 2 years unless you live in a very dry climate.
posted by 207.250.4...
, Sun, 30 Oct 2005 22:34:25, Mon, 31 Oct 2005 06:26:26 <-- Viewing This Message
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