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Author Topic: Vw back brakes  (Read 590 times)
rodders
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« on: June 06, 2017, 06:59:18 AM »

Anyone no how to get a bit of play in back brakes of standard backend of vw trike .at the moment there is no play and 1/2" movement on pedalbrakes work but are very hard.ive taken the shoes back off the drums to try get more movement in pedal but still same ive disconected the pedal and push the piston in on mastercyclinder with screwdriver still same no play just hard .as its going for its msva its got to be right cheers
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Thunderace
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Lemon Subaru


« Reply #1 on: June 06, 2017, 08:28:07 AM »

Obviously back off the wheel station ratchet adjusters
so there is a few thou of clearance between the shoes and the drum,
and the shoes are not dragging with no pressure on the pedal.

Fit a return spring to the pedal to make sure the master cylinder returns all the way back
and thus uncovers the port to allow fluid to back to pot,
and check that the tiny hole which is that port back in to the pot is not blocked.

The link bar between pedal and master cylinder can stop the master cylinder piston from fully returning and thus again not uncovering the return port.
Bad angles between the operating lever and link bar can do the same,
so sort any of that as needed and fit a return spring to the pedal,
and usually that sorts the problem.

 trike.gif trike.gif
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rodders
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« Reply #2 on: June 06, 2017, 06:34:38 PM »

Done that got about 1/2" movement now someone came with his vw this afternoon and mine as got more movement than his so will try it now cheers
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rodders
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« Reply #3 on: June 16, 2017, 05:42:52 AM »

Hiya done all you said only way to get movement in pedal is to slacken adjusters right off but then cant get handbrake to work coming to high up.i took it it for a road test on rolling rd the tester said it was in the limits to pass but he had to hold on bars and really push so advised to check a piston had not seized .i stripedthem alldown  found the person before i bought had put new shoes in but the drums was badly worn and only touchind here and there so ive put new drum and shoes on .but same problem.the brake pedal is returning ok but i still not happy at having all or nothing brakes any more ideas please
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Thunderace
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Lemon Subaru


« Reply #4 on: June 16, 2017, 07:36:57 AM »

Got to admit that since Fitz told the trick of fitting the larger bore front slaves,
I have had no problem getting acceptable results out of VW rear drums,
even with the early narrow shoes.

If you want to give me all the details of pedal ratio, master and wheel cylinder bores,
weight of machine and the force readings from the rolling road test,
I could check the numbers for sure.
Beyond that I am at a bit of a loss for the moment,
I have I pile of parts to machine this morning,
but I will keep thinking about your problem.
 trike.gif trike.gif
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rodders
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« Reply #5 on: June 16, 2017, 09:36:08 AM »

Will do later cheers
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rodders
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« Reply #6 on: June 17, 2017, 11:40:33 AM »

Hiya disconected foot pedal and just pushed the piston back in master cylinder and poston only moving 1/2 inch to lockwheels up its got a 3/4 landrover master on it and i think and standard vw back shoes someone as said the only way to alter it would be put a 5/8 master cylinder on as itwouldnt be pushing as much fluid tothe pistons.before i try this i thought as you as cost of new cylinder and if it dont work cheers
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Thunderace
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« Reply #7 on: June 17, 2017, 07:11:11 PM »

For sure Rodders, yeah the Girling Master cylinder as per as you say Landrover,
is in truth available in other bore sizes,
I think 11/16 3/4 & 5/8 were the norm,
and yeah the 5/8 would give you better pedal travel and increased line pressure.

I think Ian put a spreadsheet thing on another thread which has all the info,
but yeah the 5/8 will bolt straight in on the same bolt centres.
 trike.gif trike.gif
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rodders
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« Reply #8 on: June 18, 2017, 06:18:37 AM »

Ill get one of these then.as i said brakes passed mot but i dont like them this way as its my first vw i dont want to end up in back of someone .cheers
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