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#1 Brakes Series 1 3.8 original
Posted: Sat Apr 23, 2022 4:51 pm
by Womanofstraw
Advice needed -
Brakes working great when engine is not running but when engine is running brakes stay in after pedal is pressed.
I know my way around a car but stumped.
Thanks
WOS
#2 Re: Brakes Series 1 3.8 original
Posted: Sat Apr 23, 2022 5:35 pm
by DWW
Not an expert but sounds like it is something to do with the servo or vacuum lines.
#3 Re: Brakes Series 1 3.8 original
Posted: Sat Apr 23, 2022 10:31 pm
by abowie
Without the car in front of me my best (not really that good) guess would be that you have vacuum to the booster going the whole time.
You could start by disconnecting the vacuum line from the top of the Kelsey Hayes booster and see if this changes things. The car can be driven safely without brake boost.
Then check the air valve assembly 6 isn't jammed and that it is not being actuated with the brakes off. There is a lever on an eccentric that should be just clear of the valve with the brakes off.
Also check if the check valve c14693 on the Reservac tank is working.
#4 Re: Brakes Series 1 3.8 original
Posted: Sun Apr 24, 2022 7:34 am
by mgcjag
The service manual has a fault chart for the Kelsey servo and describes checking/setting the valves....Steve
#5 Re: Brakes Series 1 3.8 original
Posted: Sun Apr 24, 2022 8:38 am
by abowie
mgcjag wrote: ↑Sun Apr 24, 2022 7:34 am
The service manual has a fault chart for the Kelsey servo and describes checking/setting the valves....Steve
I didn't know that. Excellent.
We did 165km in my E Types today on the monthly "Exercise Class" run.