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| seriesonenut Member Since: 19 Nov 2014 Location: Essex Posts: 1221  
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A bit of Christmas Eve tinkering today on the front brakes on my series one. I have hit a problem and not sure how to overcome it. Having fitted the replacement wheel cylinder I cannot compress the shoes to allow the drum to fit. I have backed off the adjuster and un-clamped the hose. The pistons do move in a bit but come out as soon as I stop pushing them in.
Any suggestions? (and merry Christmas)  Click image to enlargefuvf1 by Richard Holmes, on Flickr Click image to enlargefuvf2 by Richard Holmes, on Flickr 1984 One-Ten CSW 2010 XS USW (sold) 1957 Series One 88 diesel 1958 Series One 88 4x2 |
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24th Dec 2021 3:13pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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In that last picture the left hand side of the brake cylinder looks to be extended. The gaiter looks to be bulging. Is the cylinder duff perhaps?
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24th Dec 2021 3:29pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Hmmm... Can you compress the two pistons using a G-clamp?
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24th Dec 2021 4:07pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17450 
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I've read somewhere that some modern wheel cylinders have internal springs which are much too powerful inside them, which pushes the pistons out (the spring should just ensure that the seal remains seated and square at all times). It looks as though you may have this problem.
The first step is to compress the pistons (if you can't do it by hand use a g-cramp as suggested above), if they immediately pop out to full extension again I suggest that you have a defective cylinder. It should be possible to push the pistons in by pressing (reasonably hard by hand) on the shoes. They should stay compressed. |
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24th Dec 2021 4:22pm |
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| seriesonenut Member Since: 19 Nov 2014 Location: Essex Posts: 1221
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Thanks. I will try a G clamp.
One other thought is could I have an airlock which is not allowing me to compress the pistons? 1984 One-Ten CSW 2010 XS USW (sold) 1957 Series One 88 diesel 1958 Series One 88 4x2 |
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24th Dec 2021 5:13pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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The air lock would allow you to compress the piston more easily, surely
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24th Dec 2021 5:29pm |
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| seriesonenut Member Since: 19 Nov 2014 Location: Essex Posts: 1221
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I have decided anything is possible with the brakes on it
 1984 One-Ten CSW
2010 XS USW (sold) 1957 Series One 88 diesel 1958 Series One 88 4x2 |
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24th Dec 2021 5:31pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17450
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If you think it is a fluid- or air-related issue which is preventing you from pushing the pistons in, then open the bleed nipple and try again.
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24th Dec 2021 7:04pm |
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| Devon-Rover Member Since: 22 Jan 2015 Location: South Devon Posts: 917 
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The pistons should freely push all the way back in, they will slowly creep back out when the cylinder is loose and the brake shoes not holding them in.
There should be no problem with pushing them all back when the hose is unclamped, Either the hose might of started to break up inside or maybe MC pushrod freeplay is not quite right and stopping the fluid flow back up the system, Hold old is the MC? I'm just spitballing here but the piston itself might of started to stick so not fully returning and the port isn't free to allow fluid return. When you clamp and force the pistons in and you say come back out makes me think that all you have done is push the wheel cylinders out around the rest of the system which return to 'rest' when you release. Also can be found on Fb, Ytube, Insta & Twitter @4WDSouthwest |
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25th Dec 2021 9:31am |
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| seriesonenut Member Since: 19 Nov 2014 Location: Essex Posts: 1221
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Hi
The MC is as old as the vehicle but fitted with a new seal kit sometime in the last 3-5 years probably. I will try compressing then clamping then un-clamping to see what happens.......but not today  1984 One-Ten CSW
2010 XS USW (sold) 1957 Series One 88 diesel 1958 Series One 88 4x2 |
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25th Dec 2021 10:13am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17450
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Internal hose faults is a good call, I once had brakes on a Series 1 which would apply but not release - the pedal pressure would push fluid through the defecting hose but the return springs were insufficient to push it back.
A similar effect can happen if the push-rod on the master cylinder has been adjusted incorrectly so that the port to the reservoir remains covered by the seals. |
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25th Dec 2021 10:59am |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3425  
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Not an expert on series brakes, but I guess very similar to early 90/110 rear drum brakes. I believe that the trailing shoe is designed to push slightly out by itself - kind of a self adjusting. The leading she is pulled back by the spring on the adjuster cam. Depends how hard it is to push the slave in.. but I do not expect it to be super light. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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25th Dec 2021 11:50am |
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| strang Member Since: 16 May 2012 Location: Happy Valley Posts: 1381 
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Tim for a Zeus disc brake conversion maybe.........
 Euro-Leafing to infinity and beyond..... |
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25th Dec 2021 5:16pm |
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| Devon-Rover Member Since: 22 Jan 2015 Location: South Devon Posts: 917
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Well I wouldn't be one to argue the logic here ^^
Click image to enlarge My 2a restoration went disc as TBH I got fed up with the constant brake setting - adjusting - maintaining cycle I was stuck in, It was a bi - monthly thing. Also can be found on Fb, Ytube, Insta & Twitter @4WDSouthwest |
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25th Dec 2021 8:49pm |
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