i have a townace royal lounge. it has new pads all round and has not lost any fluid.
could it be the servo/master cylinder?
how do we get at it/where is it?
can we repair it/replace it if need be?



- (#2180) George, 15 Jul 05 06:13

What are the symptoms you are experiencing and under what conditions? Have you bled the system recently?

- (#2180) Ian Dunse (Derbs), 15 Jul 05 07:00

we have recently bled the brakes when renewing the linings.
Symptoms -
Brake loss but they come back again!!

- (#2184) George, 15 Jul 05 07:38

When you bled the brakes did you bleed the line to the load sensing valve? This is located about midpoint between the back wheels and about half a metre forward of the back axle.

- (#2184) Ian Dunse (Derbs), 15 Jul 05 08:08

I did not bleed the load sensing valve. Did not know it existed. I assume it has a bleed nipple and will give it a go. Any specifics on how I should do it?

- (#2184) George, 15 Jul 05 08:58

When you " stroked" the master cylinder/foot pedal to pump the fluid through, did you allow the master cylinder piston to go right to the bottom of the m/cylinder bore?
Unfortunatly, with these elderly vehicles, that part of the bore is likely to be corroded, ie, in use, the piston and seal only travel a short distance and only polish a short length of the bore. You might have torn the piston seal which, possibly, will give the symptoms you now have. It's best, if you are not using a pressure type bleeding device, to always restrict the piston travel by putting a block under the pedal. However, if the load sensing valve has been overlooked, this is where the residual air might have ended up and it's bleeding could cure the problem

- (#2184) John Davis (Leics), 15 Jul 05 09:49

Have not been able to find the load sensing valve anywhere.
Have bled the brakes again anyway and they are ok at present.
When the problem occurred I had just travelled about 10 miles. Do you think this could have any bearing on the situation?
Thanks for all the help so far - much appreciated

- (#2184) George, 15 Jul 05 11:15

George

the load sensing valve (LSV) is as per my previous post and is high up under the floor. It is on the same run as the back pipes and therefore likely that there is air in the pipe. There is a smaller type bleed nipple (8mm nut). I'll try and find a diagram or pic and mail it to you.

- (#2184) Ian Dunse (Derbs), 18 Jul 05 00:51

Oops - apologies. It's not on the same run but needs bleeding all the same. The EPC doesn't give much clue to the location so I'll crawl underneath tonight and take a pic.

- (#2184) Ian Dunse (Derbs), 18 Jul 05 01:39