Lotus Elan

Brake pedal pushes back !!!

PostPost by: swiftcruiser » Sun May 20, 2018 8:59 am

Where do we go to from here !!
Now sorting brakes, replaced seals and pistons in front calipers, replaced various brake pipes fitted new Brake master cylinder,checked out rear calipers,set handbrake and all we think is as should be; even sent the Girling Mk2A servo away to be overhauled and now refitted.
The problem is; we have now bled and bled and still push the pedal after leaving for a few moments, drops nearly to floor, pump up and goodish pedal . However with engine running do the same pedal drops pump up goodish pedal but now pedal starts to push back !!! and pedal comes up !!! Has anyone experienced the same, could we have fitted the pipes the wrong way round on the servo, did make up new pipes whilst servo away being overhauled, but did check on an illustration we had so fairly certain on correctly.
Any feedback will be appreciated
Thank you
swiftcruiser
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PostPost by: oldelanman » Sun May 20, 2018 11:57 am

According to the Workshop Manual ... who reads that thing anyway ? :roll: .... pedal push back is caused by either incorrect connection of hydraulic input and output pipes or major fault within the servo. Sounds like you may have the connections reversed on the servo. Inlet from the master cylinder should go to the connection nearest the booster can, the other end is the outlet to the brakes. If that doesn't fix your problem the Manual also has a full page section on testing the servo unit itself which may help.
servo_sec.jpg and
Roger
S4 DHC
oldelanman
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