Pad Rub

[RidestreetUK]

Was setting up maggys front is ok but rear keeps rubbing badly. I moved the brake as far back in the mount as i could it seemed fine then but when i pulled the brake one of the pads doesnt go back. Help please.

[Token]

totally undo the tpa, move both the cylinders out as far as they go in the mounts, and adjust the tensioners so the wheels pulled more the center of the pads? all I can think of.

[RidestreetUK]

Well the cylinders are as far back as i can get them it doesnt rub to start with. its just when i pull the brake 1 pad goes all the way back but one gets jammed.

[Walleee]

Try claening the sticky piston thoruoghly and then lubing it.

[Jang]

Cylinder jam alllllways fun...

Best thing you can do, remove your rear wheel, remove pads.

Wind your tpa IN fully (as if you wanted it to lock straight away, not go back to the bar)

Pull lever into bar and use zip tie to hold lever in.

This will pull both cylinders right out

Next get a can of GT85 or simular

Push in with your hands one of the cylinders, this will make the other one move even further outwards

Spray with GT85

Repeat for other side

Wipe off excess from frame etc (Don't want this to come into contact with wheel/pads)

Remove zip tie

Wind your tpa OUT again

Refit pads

pull lever and see if both pads move in and out correctly.

If you find your pulling your lever a little bit and the pads arn't actually moving at all, then rebleed brake as there is air in it.

Hope that helps.

[Walleee]

like I said, better idea to clean it before you lube it otherwise you just turn the dirt into gunk.

[RidestreetUK]

Cheers guys will give it ago tonight one more very noobish question which way is in on the tpa :$ ive only just started trials so dont actually know what tpa does

[RidestreetUK]

tis sorted now the non driveside bolt was done too tight and it pulled the wheel too far to one side :$

[JT!]

What the TPA (red star) does is move the pads closer to the rim. The problem you have has occured becuase you have it wownd down too much.

Everything you need to know it here...

One of the main problems to occur with maguras is known as a ‘lazy piston’. This means that only one of the pads seems to move, and one pad seems to just sit up against the rim just skimming it. The reason for this is because you have too much TPA. If you undo your TPA right off, you will see both pads retract normally. If you do have a lazy piston, you need to re-setup your brake like instructed in the next paragraph.

The better you set up your maguras, the better they will work. If your re-setting your maguras up, undo the bolts on the clamps and remove the brake completely, make sure the large plastic washer are all intact, if they’re chewed up, it can cause problems later on.

The next thing you need to do is undo your tpa right out. This is important especially if your having lazy piston troubles. You need to undo your tpa so that the pads retract right back. You know when you have reached this point when you can pull the leaver down and it isn’t actually pushing an fluid though, this is because the pads can not physically more any further back. Now is a good time to double check you wheel is straight (if you have horizontal dropouts anyway). What some people do (including myself) is realign the wheel rather than adjusting the maguras. After doing this a few times your wheel can we at any weird and wonderful angle without you noticing.

Now, to but the brake back on. Do one side at a time. First, place the underside of the clamp down. The place once side of the Magura on top of it, but have the brake pad pushed right up against the rim. The reason for doing it like this is that it’s easier to move the brakes out, than move them back in. Also, it gets it in a good initial position. After you’ve done that, place the top part of the clamp on, and screw it down. When screwing the bolts in, try and screw them in evenly. If you screw one side right down, and then the other, your putting a lot of extra strain on the other bolt, which isn’t good where threads are concerned and how easy they strip.

Screw them down so it holds the cylinder firm, but so you can still move it about. Then you simply wiggle the cylinder back, you can actually pull the leaver to help move the cylinder back if you need to. A good guide to how far you need to pull it back is that you should just be able to put a 2p coin between the brake pad, and the rim. Once you have got it the right distance back, rotate the cylinder round so all of the pad will hit the rim, and that the surface of the pad will sit flat on the rim. Once you have it perfect, slowly tighten the bolts up, remembering to tighten them up evenly. Keep your eye on the position of the pad, and make sure it stays in the position you’ve just set it up in. Tighten the bolts down firmly, but be careful you don’t go over the top, it can damage the threads in the frame.

Now that you’ve done one side, do the same for the other side.

Now all you need to do is adjust the tpa to how you like it and there you go. It is difficult to do first time, but the more you do it the easier it will become. There are a lot of different techniques to setting up your brake, so if you find a way that suits you better, stick with it.