Front brake question

[doodguy]

How do you compress the front brake calipers? Most brakes I just throw a clamp on and tighten it.

These are different. I think 4 piston. I have the 2015 gt premium. Any links to how to videos or anything?

Thanks

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[Norm Peterson]

Different kind of clamp.

https://www.bing.com/images/search?...A292C1EB5F2D685397FEBF7319C92A3AC&FORM=IQFRBA


Norm

 

[doodguy]

Thanks This should work right?

http://www.amazon.com/gp/product/B0...ession tool&qid=1444176084&ref_=sr_1_9&sr=8-9

 

[ForTehNguyen]

check out autozone and rent the tool kit. Had all these attachments to fit all kinds of brakes

 

[Norm Peterson]

Thanks This should work right?

http://www.amazon.com/gp/product/B0...ession tool&qid=1444176084&ref_=sr_1_9&sr=8-9

Not sure. You need to be able to compress all four pistons back into their bores at the same time and squarely. Catching only half of the width of each probably won't do this. Using two longer stiff strips of steel to fully cover all of the piston areas and pressing against them to move all fur pistons may be a good enough kludge.


Norm

 

[ForTehNguyen]

this guys just using a general shop clamp. You maybe able to use a C clamp with the pads in to compress them.

[ame]

 

[Norm Peterson]

That's two clamps he's using, and the pistons that were compressed first got pushed back out some when the second pair was compressed. That means that when the first pair was compressed, the outer pair of pistons got pushed even further out of their bores than where they were with the worn pads. You really don't want to find out the hard way that they can be pushed all the way out.

I was really hoping that he'd be using four clamps, and when that didn't happen I think he should have used a brake pad to prevent the pair of pistons not being squeezed from moving back out of their bores. Especially the outers when he was compressing the inners, as they're already further out of their bores due to pad wear.

Never mind that the considerable difficulty he had in getting the outer pad out suggests that there was a small ridge on the rotor that really needs to be machined off.


Norm

 

[Edkiefer]

Even though I have tool to compress pistons, if your replacing the pads what I find easiest is just use a long thin pry bar or screw-driver .
carefully placing it between old pad and rotor and pushing pads back along with pistons .
This is done before you loosen any mounting hardware on caliper to knuckle
With multiple piston calipers you can move back and forth to keep pads going back squarely but the pads do a lot of that for you .

Make sure you crack brake master cylinder before pushing pistons in no mater how you do it and of course this only works with calipers w/o self adjustment and parking cables built in .
I have been doing it this way for over 25yrs w/o a single issue.

 

[Norm Peterson]

Make sure you crack brake master cylinder before pushing pistons in no mater how you do it and of course this only works with calipers w/o self adjustment and parking cables built in

With ABS you should be connecting a hose to the caliper's bleed fitting and cracking that fitting open. Don't be pushing the dirtiest fluid in the system back up into the ABS HCU. Don't be counting on there being enough fluid volume in the lines to prevent this from happening.

With the screw-in rear pistons, you still want to bleed the dirty caliper fluid out through its bleeder. You're going to bleed the brakes after you're done to chase the rest of the dirty fluid and any air out anyway.


Norm

 

[Edkiefer]

With ABS you should be connecting a hose to the caliper's bleed fitting and cracking that fitting open. Don't be pushing the dirtiest fluid in the system back up into the ABS HCU. Don't be counting on there being enough fluid volume in the lines to prevent this from happening.

With the screw-in rear pistons, you still want to bleed the dirty caliper fluid out through its bleeder. You're going to bleed the brakes after you're done to chase the rest of the dirty fluid and any air out anyway.


Norm

Yes, that is totally correct , I wasn't thinking on fluid quality , just piston movement . especially if you plan to replace fluid .

 

[86merc]

I use a low tech item that works great. I am sure some of you guys could also fabricate something like this for close to nothing.

 

[Impulsed7]

or just search multi-piston caliper spreader on amazon. I got the ratchet type that works really well for fast swaps.

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