Magura Hs33 Help! Quick Please!

[lukegaigertrials]

hi,

i bought a bike at the weekend with a rear magura hs33 brake,

it started with lazy pistons, however they have now got better and are now retaracting better,

my problem now is that when i pull the lever, it comes very far back and almost touches the bar, squashing my other fingers. the lever has a lot of "slack" at the beginning of the pull, and wobbles backwars and forwars when not being used im not sure how to adjust this as i am new to trials. The brake is the model with the black and white lever?

please could somebody help me on how to adjust this please

any help would be greatly appreciated!!!

thanks a lot,

Luke

Edited May 12, 2009 by lukegaigertrials

[forteh]

Sounds like the TPA could be stripped, if its an 04 or earlier brake (hose coming out of the lever parallel with the bars) then you can bodge the tpa with a bolt - search through the wiki on how to fix it under 'TPA bodge'. You can buy TPA replacements for the newer brakes (hose coming out at an angle) from tartybikes.

Get the TPA sorted 1st, wind it all the way out and then rebleed the brakes and it should be sorted

[JT!]

OK, the 'slack' you feel is the space before the leaver actually starts pushing the fluid through. So what you need to do is adjust your TPA (red dial) unil that slack is taken up.

Then, if the brake is fine you're good to go, if it's still pulling too far down, you need to ajust the tpa even more, however if you adjust it too much, you get the problems with the lazy pistons you are talking about.

If that is the case, unwind the tpa so the pads fully retrct back to the pistons (this is the same point when you have just taken up the 'slack' you talked about).

Then, you need to undo the clamps that hold the pistons and move them closer to the rim, you need to have the pads pretty close to the rim, about a pennies width. Then, tighten up the bolts and see if that's any better.

The idea of a magura is to only use the tpa to take up the slack, and then only use it a couple of twists beyond that point.

If your tpa (red dial) isn't working, post back here and let us know and we can link you to a topic on how to fix that.

Edited May 12, 2009 by JT!

[Luke_zoo]

If the TPA doesnt work take it out the leaver and see if it has snaped and if it has snaped removed the snaped part in your leaver, Take off the red top of the TPA and replace with a magura bolt for your mounts and put all the parts to gether and your brake will be fine , But IMO I would bleed it up agen.

[lukegaigertrials]

hi,

thanks, for all the replies

i looked at the tpa last night, and im pretty sure its not broken or snapped, but it is seized/wont screw in or out?

now what do i do?

thanks again ,

Luke

[JT!]

Does the leaver look like this:

or this?

[Tony Harrison]

Wind in the TPA, set up the caliper properly (4-bolt mounts help with that, but I've seen some truly retarded brake setups before) and then rebleed from the bottom. Give the leaver internals a clean-out, and put a light smear of lube (something like 3-in-1, not WD40 or GT85) around the piston to ensure it's sealed. Do this whether you use hydraulic oil or water. If you don't have a bleedkit you can always use the old submerse in a sink method.

[lukegaigertrials]

Does the leaver look like this:

or this?

it looks like the first one ( the grey and black one)

Wind in the TPA, set up the caliper properly (4-bolt mounts help with that, but I've seen some truly retarded brake setups before) and then rebleed from the bottom. Give the leaver internals a clean-out, and put a light smear of lube (something like 3-in-1, not WD40 or GT85) around the piston to ensure it's sealed. Do this whether you use hydraulic oil or water. If you don't have a bleedkit you can always use the old submerse in a sink method.

thanks, but the tpa wont move

[lukegaigertrials]

hi,

i had a look at the lever today, and my dad thinks that the thing that the tpa pushes, to push the fluid through, isnt retracting properly once it is pushed? he thinks that this is causing

the wobble/play in the lever? if this is what the problem is, will i need a new lever or will i be able to fix it?

any help is extremeley appreciated!

Thanks

Luke

[JT!]

Well, it's really difficult to tell what's really going on if you're not there, but becuase your tpa is broken, you won't be able to adjust the point that pushes the piston on the lever blade, so to someone who hasn't had much experiences with maguras would think that the piston in the lever was getting stuck, i can almost guarantee it's not. The problem isn't the piston not coming out far enough, it'll be the prong on the lever blade not coming in far enough.

However, you can replace what you have now with these:

http://www.tartybikes.co.uk/search.php?category_id=53 (I'd suggest the cheapest one)

Some come with a tpa, some don't. So if you decide to go with one that doesn't come with a tpa you'll need one of these:

http://www.tartybikes.co.uk/product.php?pr...p;category_id=5

The whole thing would come to just over £10.