Dreamed · Jun 2, 2019

Hey landys,

Nab questions.

I removed both front brakes (first time ever) and now I have doubts putting them back, as both sets are mixed together. I cannot remember which guide pin goes on top (the short one with plastic or the long one?).

Also I see brake pads have one of the edges bent. Again, does it matter which way I fit the pads as long as they fit correctly? (they probably go one way anyway).

Cheers!

Nodge68 · Jun 3, 2019

I don't think it makes a difference, which pin goes where.

The pads should always go back from the location they came from, or disc overheating will occur. If you can't remember, when sand the pads flat, using some emery paper on a flat surface.

Dreamed · Jun 3, 2019

OK, thanks!

I actually can't remember anything as rain stoped me from working for a long time

, I hope 400 sand paper will do.

Nodge68 · Jun 3, 2019

Dreamed said:
OK, thanks!

I actually can't remember anything as rain stoped me from working for a long time , I hope 400 sand paper will do.

It'll do. You're after taking off the high spots, so localised heating doesn't occur.

Dreamed · Jun 3, 2019

Cheers Nodge!

And for those who care about the guide pins, I found reliable information saying that from 2003 onwards the shorter guide pin with rubber bushing are to be used as trailing pins.

Trailing pins are basically the ones that come second as the rotor spins. In my case the callipers are mounted in front of the rotor, so the trailing pin is at the bottom.

andyfreelandy · Jun 3, 2019

Dunno if it helps, but Haynes shows pads with a chamfer, never seen it myself, but they state "horizontal chamfer is outboard and sloping chamfer is inboard. I would say that if they are chamfers rather than wear marks then the leading edge in direction of travel is the chamfered one.

Dreamed · Jun 3, 2019

andyfreelandy said:
Dunno if it helps, but Haynes shows pads with a chamfer, never seen it myself, but they state "horizontal chamfer is outboard and sloping chamfer is inboard. I would say that if they are chamfers rather than wear marks then the leading edge in direction of travel is the chamfered one.

Nice! Cheers Andy! Second piece of the puzzle demystified, almost.

First of all, only one sloping chamfer can be used as the leading edge on the direction of travel. The other pair is reversed. If “horizontal chamfer” means the one opposite to the sloping chamfer (monkey scratching head) then everything Haynes says makes sense ish.

I also assume - inboard pad- is the one closer to the engine.
So basically the sloping chamfer goes on the leading edge in the direction of travel ONLY for the inboard disk (top position). It’s position is reversed on the outboard disk. I assume the inboard disk suffers the most stress ? And they are reversed because there is also ‘reverse braking’. Monkey scratching head on the other side, different finger.

Either way, their position most likely makes no difference.

Nodge68 · Jun 4, 2019

The imprint of the piston or yolk will give a clue as to which pad goes where. If the pads are fitted with reeds, then those go inboard with the reed at the top, which narrows the fitted location further.

Dreamed · Jun 4, 2019

Nodge68 said:
The imprint of the piston or yolk will give a clue as to which pad goes where. If the pads are fitted with reeds, then those go inboard with the reed at the top, which narrows the fitted location further.

That’s spot on! I could still see the pistons’ imprints. That’s a great tip .

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