Slow brake return

Technical advice Q&A

Topic author
Landcrab
Posts: 29
Joined: Thu Oct 05, 2017 8:51 pm
Sweden

#1 Slow brake return

Post by Landcrab » Mon Sep 14, 2020 6:33 pm

Hello all experts, I wonder if someone has a guess and could point me in the right direction.
I’m helping a friend with his completely restored s1 1967 car.
When you brake it stops perfectly but with a delay when the system return the fluid and completely release the brakes. My main question is if I should aim for the master cylinder or the servo cylinder?

Greatful for any help on the topic

Regards Johan
1965 fhc

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christopher storey
Posts: 5698
Joined: Sun Mar 09, 2008 3:07 pm
Location: cheshire , england
Great Britain

#2 Re: Slow brake return

Post by christopher storey » Tue Sep 15, 2020 6:56 am

This is usually a servo fault, in which the servo hydraulic shuttle is sticking, but the first thing I would check is that the air valve at the front of the servo control unit ( on the front of the master cylinder ) has a. a clean filter and b. is not itself sticking . If you do the advanced search "+air +reaction +valve" on this board you should find plenty of discussion about this

here is a link to one such discussion

http://forum.etypeuk.com/viewtopic.php? ... te#p114864

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