109 brake problem

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perdix

New Member
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246
Location
under the 109....................where else?
Fitted new rear wheel cylinders and copper pipes from the 3 way splitter to the cylinders yesterday and bled them up for ages and ages but I,m still not getting any pedal.the previous **** that owned it ran the old girl just on the front brakes after he stripped the threads in both rear cylinders and attempted to sort it by putting them back in with PTFE tape :eek:
So anyone have any ideas what the problem might be or is it just a case of bleed,bleed,bleed until I get somewhere?
Cheers;)
 
Assume you have bled the front wheels as well

if you clamp off the rear flexi and the front two flexis, if no air in that bit you should get a hard pedal, if its still soft suspect the master cylinder seals, MC leaks, pipe leaks. seals prefer to fail in cold weather

if its hard remove a front flexi, if pedal goes spongey then problem that side, if its still hard remove the other front flexi , if it goes soft then problem at front, if still hard remove rear flexi and you have located the area of problem.

keep master cylinder topped up

check bleeding technique

the pressurised bleeding kits that work off the tyre pressure are good or even the one way valve bleed pipes
 
they are an utter pain to bleed, i have the same problem on mine everytime i need to bleed the brakes its nearly always the front, the easyest way i know of is to remove the backing plates on the front leaving shoes attatched and turn it so the bleed nipples face upward, this is possible with the flexi
by doing this is stops the air lock in the wheel cylinders. once you have done this the brakes are easy to bleed. its nearly always the front on 109 brakes due the twin leading shoe
 
Another way with the front is to bleed the top cylinder by partially undoing the union that runs between the cylinders. Bit of a pain and you need a helper but works well. Bleed at nipple 1st as normal then pump up brakes hard and undo union and pinch up again at bottom of brake pedal stroke. You need plenty of rag to prevent fluid getting everywhere but a couple of strokes will do the job. I bleed again at the nipple just to be sure
 
Cheers Blue Beasty ,I will try that tomorrow as my assistant is having a bloody pyjama day and she,s refusing to come out and play :mad:
Found the flexi and after clamping it off the brakes are solid so the air is definately at the rear of the Landie.
Onwards and upwards
 
Are you sure the springs are in the right positions ?
If you give a couple of pumps I take it the pedal is good for a second or so ?
Take off the resivour lid pump the pedal and get somebody to watch the fluid level, if it starts to come up while the pedal is pressed then the springs are to tight and they are squeezing the whole lot shut
 
pobby said:
Are you sure the springs are in the right positions ?
If you give a couple of pumps I take it the pedal is good for a second or so ?
Take off the resivour lid pump the pedal and get somebody to watch the fluid level, if it starts to come up while the pedal is pressed then the springs are to tight and they are squeezing the whole lot shut
Click to expand...

The springs looked to be ok Pobby but the be honest when I put the new cylinders in I spragged the shoes open and never removed the shoes or springs:eek:
I,ll check that as well tomorrow cheers:cool:
 
109party said:
they are an utter pain to bleed, i have the same problem on mine everytime i need to bleed the brakes its nearly always the front, the easyest way i know of is to remove the backing plates on the front leaving shoes attatched and turn it so the bleed nipples face upward, this is possible with the flexi
by doing this is stops the air lock in the wheel cylinders. once you have done this the brakes are easy to bleed. its nearly always the front on 109 brakes due the twin leading shoe
Click to expand...

:eek:
OK.I,ll look at that too.
Found trying to get to the bleed nipples on the front axle a bloody pain in the arse to he honest and maybe didn,t spend as a long as I should have bleeding them.
My old 88" was never as much hassle as this but I,m coming to the conclusion that this old girl is worth it.Reckon she has been stood a while as there is a bloom on some of the bits(glow plug terminals,master cylinder etc)
Got to say that I wasn,t looking forward to coming back to 4 wheels after doing the bike club thing for 4+ years but having a big fook off mechanno kit is growing on me once again.Still wish I,d waited for an 88" mind you:rolleyes:
 
Well I,m still struggling with these frigging brakes :mad:

Still got some braking but when the pedal is depressed(or is that me!) there is no gradual application of the brakes.Its like treading on a house brick but the pedal goes about 1/2 way down to the floor?It also does stop but not as well as my old SWB did.
I clamped the rear flexi and that gave me the same effect but the pedal only went 1/4 of the way down .Still the same really solid feel though.I looked again at bleeding the front brakes but one of the nipples is rounded off!
Wondering if it has servo issues to as wether its running or not there seems to be little difference in the feel of the brakes.Want to get it sorted as I,m tempted to move the old girl on in favour of a SWB and theres no way it can be done til this is 100% right.
Its a later servo-assisted dual system so any ideas please chaps?
 
Last edited:
If you have a servo fitted you need to run the engine whilst bleeding your brakes!

Otherwise it just don't happen!!
 
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