hello can i get some advice please...
 

Hi my name is mat just after some advice reguarding an air leak around the brake-booster on my 78 model Bedford TK860, diesel motor any help would be greatly appreciated thanx

Is the leak from a pipe, or, perhaps internally?

Does the leak only occur when the footbrake is applied?

The brake-booster (master cylinder actuator) has pistons with seals.

http://i24.photobucket.com/albums/c1...n/IMGP8509.jpg

Instructions to overhaul the actuator:-
http://www.truckandbusforum.com/show...2&postcount=32

Taken from:- http://www.truckandbusforum.com/show...?t=3900&page=4

(which includes instructions for overhauling the hydraulic cylinder and installing the assembly - clearances etc.)