986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Brake pedal stops normally then slowly fades to floor. Master cylinder? Booster?

Rotmilky · 07-30-2017, 10:07 AM

Well, I replaced the ABS with a used one from a wrecked 2001 base. It had the same part number as mine (it's a 2001 S), so I figured it'd work. Installed it this morning, bled the brakes (and bled and bled and bled...there's a lot of air in the ABS to get out). Took her for a test drive and the brake pedal is back to normal. Woohoo! Nice to have normal brakes again.

Lucky thing there are a lot of used ABS units out there at a reasonable price (I paid $70). A new one from Porsche is about $3000.

So, if anyone happens across this thread in the future and has a similar issue. If a replacement master cylinder doesn't fix the brake fade, take a look at the ABS.

07-30-2017, 10:07 AM	#39
Rotmilky Registered User Join Date: Feb 2017 Location: New Mexico Posts: 42	Fixed! Well, I replaced the ABS with a used one from a wrecked 2001 base. It had the same part number as mine (it's a 2001 S), so I figured it'd work. Installed it this morning, bled the brakes (and bled and bled and bled...there's a lot of air in the ABS to get out). Took her for a test drive and the brake pedal is back to normal. Woohoo! Nice to have normal brakes again. Lucky thing there are a lot of used ABS units out there at a reasonable price (I paid $70). A new one from Porsche is about $3000. So, if anyone happens across this thread in the future and has a similar issue. If a replacement master cylinder doesn't fix the brake fade, take a look at the ABS. __________________ V.H. Whitley Owner of Waaay too many vehicles Non Porsche :1959 International B120, 1960 International B120, 2015 BMW M3 Porsche: 1997 986, 2001 986S, 1968 911L, 1968 911S, 2005 911, 1984 928, 2008 Cayenne S.