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Unanticipated Wetness

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sarahe95
Posts: 5
Joined: Tue May 27, 2014 1:16 am
Location: Greensboro, NC USA

Unanticipated Wetness

Post by sarahe95 » Sun May 16, 2021 7:04 pm

Clutch failed on my 87 635Csi. So, I have the new MC and slave cylinder in hand and removed the seat, etc. to get a clear look.

While under there, I noticed where the brake master cylinder pushrod emerges from the firewall was a little wet.
Since the regulator & bomb sit between the master cylinder and the pedal, should I look at replacing them, or the MC? Maybe both?

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Ralph in Socal
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Joined: Tue Apr 14, 2009 3:32 am
Location: High Desert of SoCal

Re: Unanticipated Wetness

Post by Ralph in Socal » Sun May 16, 2021 8:10 pm

That’s the hydraulic brake booster that’s leaking at the rear seal. Contact JCS for his rebuild or parts services.

Unfortunately the booster and M/C work in tandem and are bolted together. Fixing one or the other usually ends up causing a leak in the other unit so best to refresh both at the same time.

The regulator and bomb are only connected to the booster with hoses. Good luck.

Ralph
There is a very fine line between "Hobby" and Mental Illness.

85 635csi Zinno Auto
84 528i Euro
83 635 Euro Arktik
81 528i Kastanien 5-speed
88 528e Bronzit (Granpa Car)
86 535i Auto (For Sale)
81 633 csi (retired)

sarahe95
Posts: 5
Joined: Tue May 27, 2014 1:16 am
Location: Greensboro, NC USA

Re: Unanticipated Wetness

Post by sarahe95 » Sun May 16, 2021 11:34 pm

So, repair the regulator, and replace the MC and brake bomb?

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