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Boot seals on 850 front calipers

  • Thread starter Thread starter nisom512
  • Start date Start date
N

nisom512

Guest
So this is kinda a weird question but I am sure its been answered before

I am just taking apart my front calipers cause when I bought the bike they were seized up.

So i have cleaned them now and am in the process of putting them back together and am finding it hard to figure out which way to put them back together.

1. do I put the boot seal (not the ring seal) on first then try to maneuver the piston in around it?

2.do I put in the piston first then the boot on and try and stuff it into the seal?

I couldnt get either of these to work but maybe I didnt try hard enough.

Thank you
Jake
 
stretch the bootseal/cover over the piston so it sits half way down and then but the seal into the caliper making sure its seated and just push the piston in and watch the top lip fall in place. Make sure ALL the corrision is removed from the area where the seal and cover sit. wipe a bit on brake fluid on the seal to help the piston slide in
 
BassCliff said:
You've probably seen these, but I've collected some brake tips: CLICK HERE.

BassCliff
Click to expand...

BassCliff's "brake tips" include a method using compressed air that comes courtesy of 49er:

First fit the dust boot to the caliper. Lube the edges of the boot (where it will contact the piston) with new brake fluid, then fit a compressed air gun (low air pressure!) into the bleeder orifice and pull the trigger while lightly pressing the piston against the sealing lip of the boot. The compressed air causes the boot to swell and envelope the piston and voila!, the pistons are fitted. You do need to keep the piston relatively central to the boot opening to make it work. This method will avoid any damage to the boots, which can happen while trying to manually stretch them over the pistons.

I've tried this method from 49er and it works like a charm!

Tomcat
 
Last edited:
tomcat24551 said:
BassCliff's "brake tips" include a method using compressed air that comes courtesy of 49er:

First fit the dust boot to the caliper. Lube the edges of the boot (where it will contact the piston) with new brake fluid, then fit a compressed air gun (low air pressure!) into the bleeder orifice and pull the trigger while lightly pressing the piston against the sealing lip of the cover. The compressed air causes the covers to swell and envelope the piston and voila!, the pistons are fitted. You do need to keep the piston relatively central to the boot opening to make it work. This method will avoid any damage to the boots, which can happen while trying to manually stretch them over the pistons.

I've tried this method from 49er and it works like a charm!

Tomcat
Click to expand...


wow well that sounds great too. now if only I had an air gun....:(
 
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