My 88" Series 3 has dual line servo assisted brakes, which I believe has been fitted after manufacture. I have changed the front brakes from 11" x 3" to 11" x 2.25" backplates/drums/pads. I also replaced the master cylinder with type 90577520G.
The system needs to be drained for MOT pipe replacement. I know (instruction 70.00.00) that on the 88" dual line, the front compartment is supposed to supply the rear, and the rear supply the front. This is how it is currently set up. The 109" is the opposite.
I've read that the volume of fluid sent to the front/back is different. If the dual line brakes on a 88" and a 109" are identical at the corners, then there is a conflict with that idea.
Is the pipe arrangement correct for this vehicle? (I think the rear is the 109" type... not sure).
Before I took it off-road for front cylinder/drum/pad/rubber pipe replacement, the pedal took a few pumps before it became solid. I had already bleed the system when changing the master cylinder, with little difference.
Of course, I was stupid enough to saw the hoses off before realising that I had 2.25" parts instead of 3" - in case anyone is wondering why I went from 3" to 2.25". And of course the wheel cylinder had a stuck bleed nipple too (and no replacement that fitted the backplate). Nothing quite like not being able to fit all the shiny new parts whilst my supplier loses the backplates I ordered in the post. Even still, I'm sure others have had worst moments.
When I drove to the MOT station (only place I can drive), I felt that the pedal had much improved. However, there is still room for improvement. Perhaps fitting the servo vacuum tank (see thread: https://www.lrukforums.com/forum/showthread.php?t=37958) will solve the problem, or maybe not. Seems only to affect road use though.
I would like to draw a HUGE line under this problem, and worry about lesser things like broken heater control wires and water leaks (fitted with at least two).
Jonathan Paton
The system needs to be drained for MOT pipe replacement. I know (instruction 70.00.00) that on the 88" dual line, the front compartment is supposed to supply the rear, and the rear supply the front. This is how it is currently set up. The 109" is the opposite.
I've read that the volume of fluid sent to the front/back is different. If the dual line brakes on a 88" and a 109" are identical at the corners, then there is a conflict with that idea.
Is the pipe arrangement correct for this vehicle? (I think the rear is the 109" type... not sure).
Before I took it off-road for front cylinder/drum/pad/rubber pipe replacement, the pedal took a few pumps before it became solid. I had already bleed the system when changing the master cylinder, with little difference.
Of course, I was stupid enough to saw the hoses off before realising that I had 2.25" parts instead of 3" - in case anyone is wondering why I went from 3" to 2.25". And of course the wheel cylinder had a stuck bleed nipple too (and no replacement that fitted the backplate). Nothing quite like not being able to fit all the shiny new parts whilst my supplier loses the backplates I ordered in the post. Even still, I'm sure others have had worst moments.
When I drove to the MOT station (only place I can drive), I felt that the pedal had much improved. However, there is still room for improvement. Perhaps fitting the servo vacuum tank (see thread: https://www.lrukforums.com/forum/showthread.php?t=37958) will solve the problem, or maybe not. Seems only to affect road use though.
I would like to draw a HUGE line under this problem, and worry about lesser things like broken heater control wires and water leaks (fitted with at least two).
Jonathan Paton