+2 new servo problem

[checkrail]

Hi, I swapped my Lockheed servo over for a look-a-like one from MGB Hive, it came as a complete kit, very pleased with it.The instructions on bleeding it by 'cracking open' the outlet pipe with the pedal depressed several times worked a treat ------ air hissing out giving a really firm pedal
When I checked the brake pipe connections the inlet one was weeping slightly it had a small split on thr flare so I fitted a new pipe and connections
The problem I now have is the brake pedal is now spongey with too much travel, I've gone round and bled the brakes with no sign of any bubbles. Cracking open the servo outlet now makes no difference.

Any help would be really appreciated Thanks John.

[alanr]

John,
Spongy brake pedal is air in the system.
You need to completely bleed the whole car brake system again.

Alan.

[Robbie693]

Hello John,

I have just been bleeding my brakes after fitting new calipers, it can be tricky to get a firm pedal. There are a few things you can do to improve matters.

I used a Gunson Easy Bleed as a pressure bleeder, no fluid in the Gunson bottle, just a very low pressure of around 10psi.

Start at the wheel furthest away (N/S rear if RHD) and go around a couple of times bleeding each caliper.

Disconnect the servo from it's mountings and angle the servo so that the outlet is vertical and bleed again.

Whilst bleeding tap the calipers and pipes with a bit of wood/screwdriver handle as this sometimes releases air.

When done wedge the pedal down with a piece of wood between pedal and seat and leave overnight. Air will percolate out of the master cylinder and the fluid level will drop a bit.

If any sponginess is still present, go for a short drive if safe and re-bleed.

With a bit of luck you should then have a firm pedal.

Good luck

Robbie

[checkrail]

HI Robbie, thanks very much for all your suggestions, wedgeing the pedal down over night has worked, a firm pedal with very little travel

cheers John

[Robbie693]

Result!

Great John, glad to be of some help

Robbie