Brake servo woes
Discussion
Evening Peeps
As per the title my brake servo is on its last legs- Too much pedal travel and slowly sinking ie: losing vacuum probably due to the corrosion on the underside.... could some one let me know what the servo is off and possibly point me in the direction of a new one please.
Thanks in advance
Ron
As per the title my brake servo is on its last legs- Too much pedal travel and slowly sinking ie: losing vacuum probably due to the corrosion on the underside.... could some one let me know what the servo is off and possibly point me in the direction of a new one please.
Thanks in advance
Ron
Before you start replacing he servo check the slave and master cylinders. ..
Any loss of fluid?
Any fluid on the pedal?
Is the fluid in the resovoir black?
When you press the pedal does the fluid in the reservoir lower?
All indicate seal failure iether in the master with fluid getting past the seals same in the slave, tired fluid with moisture / air in the system.
Chris
Any loss of fluid?
Any fluid on the pedal?
Is the fluid in the resovoir black?
When you press the pedal does the fluid in the reservoir lower?
All indicate seal failure iether in the master with fluid getting past the seals same in the slave, tired fluid with moisture / air in the system.
Chris
Hi Chris
The symptoms are thus:-
No apparent fluid loss
Pedal travels a long way before brakes start to bite
If sitting at lights etc with pedal depressed it slowly sinks until almost on floor
If pedal depressed and then ignition turned off the pedal gets harder and pushes up against your foot
Under normal use after braking the pedal returns to normal position only slowly not springing back straight away
Not had a chance to inspect for anything else this evening as at work today I managed to put a pretty deep slice into the index finger of my left hand with a stanley knife!!
Any thoughts? Any help appreciated
The servo will need to be replaced anyway regardless as its very rusty on the underside so I need to know what its from also. Many thanks All
The symptoms are thus:-
No apparent fluid loss
Pedal travels a long way before brakes start to bite
If sitting at lights etc with pedal depressed it slowly sinks until almost on floor
If pedal depressed and then ignition turned off the pedal gets harder and pushes up against your foot
Under normal use after braking the pedal returns to normal position only slowly not springing back straight away
Not had a chance to inspect for anything else this evening as at work today I managed to put a pretty deep slice into the index finger of my left hand with a stanley knife!!
Any thoughts? Any help appreciated
The servo will need to be replaced anyway regardless as its very rusty on the underside so I need to know what its from also. Many thanks All
Yeah, me too. if the servo was faulty, then the pedal would get really hard to push.
Sinking pedal means Mcyl seals are probably worn. The Mcyls don't always leak...
Take mcyl off the servo (2 nuts) and I'll bet it's wet with brake fluid at the back of Mcyl.
or check the 'drain' (there's a hole underneath on the MCYl flange - try testing with a tissue)
Been there, but I had a very slight weep down the servo from drain, which was a dead giveaway.
New seals fixed it.
Sinking pedal means Mcyl seals are probably worn. The Mcyls don't always leak...
Take mcyl off the servo (2 nuts) and I'll bet it's wet with brake fluid at the back of Mcyl.
or check the 'drain' (there's a hole underneath on the MCYl flange - try testing with a tissue)
Been there, but I had a very slight weep down the servo from drain, which was a dead giveaway.
New seals fixed it.
Early wedges (2.8, like mine 1982) are definitely Cortina Mk4 or 5, both servo and Mcyl
I think later wedges went to Rover SD1 ? not sure -
Someone like Wedg1e will know !! (hint...)
Mcyl is Cortina, ref PMF226, 20.6mm dia, 3x10mm outlets. Haven't got servo ref no
Anything within reason should work around the 20mm dia, provided it fits....
I wondered about a Sierra one (22.2 mm), but would have slightly firmer pedal
I reckon the TR6 setup from my Vixen S3 might even fit, apart from the UNF threads that is....
I think later wedges went to Rover SD1 ? not sure -
Someone like Wedg1e will know !! (hint...)
Mcyl is Cortina, ref PMF226, 20.6mm dia, 3x10mm outlets. Haven't got servo ref no
Anything within reason should work around the 20mm dia, provided it fits....
I wondered about a Sierra one (22.2 mm), but would have slightly firmer pedal
I reckon the TR6 setup from my Vixen S3 might even fit, apart from the UNF threads that is....
I agree with others as i have had the same in the past and it was defo the master cylinder. dont mess about with seal kits or re con get new. my experience of seal kits is they dont last long and difference between new and re con isnt enough for me to bother with. got mine from RT Racing
Gassing Station | Wedges | Top of Page | What's New | My Stuff