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Re: 06 93 Aero Brake Vacuum Pump turns on often Posted by SWEDECAR [Email] (#112) [Profile/Gallery] (more from SWEDECAR) on Wed, 20 Jun 2018 07:59:45 In Reply to: 06 93 Aero Brake Vacuum Pump turns on often, Johnny B, Tue, 19 Jun 2018 18:52:33 Members do not see ads below this line. - Help Keep This Site Online - Signup |
As long as the pump stays quite when you only have the ignition on, it should be ok.
When you push the brake pedal it should come on for a few sec and then stay quite again.
If it constantly keeps running or cycling on and off, you have a leak somewhere.
One place that easily gets overlooked is where the brake vacuum pipe snakes around the brake booster and is covered with an aluminum heat sleeve to protect from turbo heat. The pipe can crack inside the sleeve and it's hard to see or notice the hissing noise.
Anders
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