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DLK

Member Since: 12 Mar 2013
Location: Scheveningen
Posts: 70

1986 Defender 90 200 Tdi SW Zambezi Silver

What master brake cylinder?

Hello All,

I have changed the axles under my 1986 90 for a set of 300Tdi axles.

Now front and rear axle have brake discs, the previous axles had front discs and rear drums.

When bleeding the brakes I got the feeling the master brake cylinder is on its way out. If i retain pressure on the pedal I can feel it fading away. When I keep pressure on it can push it all the way to the bottom. No leaks on the brake lines so my guess is that I need a new MBC.

What partnumber do I need? I can't for the life of me figure that out.

Some data;
Axles have new calipers, the AP type with one hose to each front caliper
non-vented discs all round
it's a 1986 90
standard brakes

Who can help me wit this?

8th Apr 2013 2:47pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7695

2011 Defender 110 Puma 2.4 USW Stornoway Grey

does the pedal go to the floor with the engine running or not once brake pressure has been reached.

does it stop well currently?

could be fluid leaking past the piston seal in the MC or if the pedal is slowly sinking with the engine running it may in fact all be good, esp if you have a good vac/oversized one.

i run the same setup as you on two vehicles. one 84, the other 93regs.

i have also fitted disco brake servos to them both as they are bigger with great res of vac. they are not autos so need a little more brake use than a man, esp off road.

the 93reg one, does similar to what you describe, in that you can find brake pressure and stop but the pedal very slowly continues to drop a bit. i fitted new servos, pipes, pistons the lot, then spoke to someone with far more knowledge that stated some newer cars do that anyway. Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop

8th Apr 2013 9:37pm

DLK

Member Since: 12 Mar 2013
Location: Scheveningen
Posts: 70

It does brake quite well. But I do have the idea the brake pressure fades away while holding the brake pedal pressed in.

I can imagine that being quite scary while offroading and having to hold it steady on a steep hill.

So any one know what master brake cylinder i need?

David

9th Apr 2013 4:18pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7695

how many ports does it have?

how far down does the pedal go?

once it has stopped moving do you loose braking ability? Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop

9th Apr 2013 4:50pm

DLK

Member Since: 12 Mar 2013
Location: Scheveningen
Posts: 70

It has two ports. One for the front and one for the rear brakes.

I can push it in 3/4 of the total travel

Have not tried to see if it holds pressure on the brakes.

9th Apr 2013 8:47pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7695

i will see what i have hear and check against MPN for 2 port.

does it stop at the 3/4 travel

if it holds the brake pressure then you dont have an issue. Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop

9th Apr 2013 9:00pm

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