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Brake servo connections
Posted:
Mon Aug 03, 2009 12:19 pm
by cdraper
Re: Brake servo connections
Posted:
Mon Aug 03, 2009 12:45 pm
by rdssdi
I used Lockheed remote servos. For these servos the master cylinder feeds to the port on the side of the casting closest to the vacuum canister. The outlet to the brakes is at the very end of the casting furthest from the vacuum canister.
If you have installed the original Girling units I am not certain the layout is the same.
You might check if the vacuum return check valve is working or even there. It is attached to the end of the metal vacuum pipe that runs along the firewall. At least in my U.S. LHD car it is.
Bob
Re: Brake servo connections
Posted:
Mon Aug 03, 2009 2:32 pm
by TeeJay
Hi,
On my 1968 +2, single Girling servo.
The pipes are connected as per the Manual, see detail below.
Also see the attached re the testing of the unit re the "brakes hanging on".
If you PM me your e-mail address I can forward you the Girling 9 page document.
Hope this helps.
Re: Brake servo connections
Posted:
Mon Aug 03, 2009 9:54 pm
by barrydoran
Brakes locking on and pedal pushing back are well known symptoms of a failed Girling servo. Have a search around.
viewtopic.php?t=1587I speak from experience, mine failed in exactly the same way.
I was told that it can be caused by dirt in the fluid stopping some internal ball bearing seating properly.
So try bleeding with plenty of fluid throught the servo.
Barry.
Re: Brake servo connections
Posted:
Tue Aug 04, 2009 10:53 am
by cdraper
Thanks guys - clearly my servo is connected the wrong way - with th pipe from the master cylinder fixed to the rear port and the one to the brakes next to the vaccum chamber! Have no idea who did this or why - when I fitted a reconditined servo I just connected it up the same way.
Does anybody else know caes like this?
Re: Brake servo connections
Posted:
Tue Aug 04, 2009 8:58 pm
by handi_andi
I had a brake locking on problem for a while and turned out to be the remote servo. Spot to Classic Brake Company about it and turns out it is a common problem on the remote servo with the little hydraulic piston sticking. Simply solution was to pop the piston out using brake pressure, clean the bore very carefully with a bit of emery paper and a rod. Clean up piston, reassemble, bleed brakes, and bobs your uncle problem solved and brakes better than normal.
Could be the same issue...
Andy