Im going to be replacing my discs and pads hopefully at the weekend (weather permitting) I wanted to know if i need to take the cap off the brake resivoir when i wind the pistons back in? Also do i need to bleed the system if i do :no:

Im going to be replacing my discs and pads hopefully at the weekend (weather permitting) I wanted to know if i need to take the cap off the brake resivoir when i wind the pistons back in? Also do i need to bleed the system if i do :no:

Hi

Unscrew the res cap but leave it resting in place on top of the res if you are working outside, befor you push the front pistons back and wind back the rears and keep an eye on the fluid level to make sure it does not overflow.

There is no need to bleed the system afterwards provided you have not undone any pipes.

Make sure you clean the hub faces with wire wool or smooth emery cloth befor you fit the new disc's and clean the preservative off the new disc's befor fitting.

When finshed recheck the fluid level.

HTH

Bill.

Im going to be replacing my discs and pads hopefully at the weekend (weather permitting) I wanted to know if i need to take the cap off the brake resivoir when i wind the pistons back in? Also do i need to bleed the system if i do :no:

I just loosen off the reservoir cap out of habit. In theory you don't have to touch it though, because the reservoir isn't sealed, if it was the brakes wouldn't work. Just watch the fluid level when you're pushing in more than one piston.

You don't have to bleed the brakes, but you may aswell if you have the time. Be careful with the bleed nipples though. If you think they are too tight and you feel they will snap before moving, then just be aware of the can of worms you may be opening! A good quality single hex ring spanner and some releasing fluid should help though.

Just did my rears the other day and didnt unscrew the lid, in honesty it was an oversight as I usually do, but it all worked and everything normal afterwards.

On another note and sorry to hijack your thread but its slightly relevant, are the front caliper pistons wind back or push in? I'm presuming push in as the rears also have the handbrake mechanism or am I wrong? Just wondered before I strip the fronts off.

Cheers,

Steve

Fronts are push in, rears are wind in.

Fronts are push in, rears are wind in.

Many thanks Bertee:thumbup:

Just did my rears the other day and didnt unscrew the lid, in honesty it was an oversight as I usually do, but it all worked and everything normal afterwards.

On another note and sorry to hijack your thread but its slightly relevant, are the front caliper pistons wind back or push in? I'm presuming push in as the rears also have the handbrake mechanism or am I wrong? Just wondered before I strip the fronts off.

Cheers,

Steve

As you thought, the fronts are the normal push in affair, so nothing out of the ordinary. The rears only have it due to the integrated handbrake mechanism.

And as you found, no problems with leaving the cap on, as the cap has a vent in it to allow air in and out as the pistons move in normal operation.