When pushing the brake piston back in do you need...

[saalro]

It will be easy, i've found out all i need too now. All i'm doing is changing the pads!

I'm not really touching the majority of the system, just Loosening a nipple slightly, might even just loosen the fluid cap and push the piston in really slowely bit at a time, besides if i'm worried at all after i'll take it to the garage. But i'll test it loads first!

[Diamond Hell]

You're aware of the risks then?

Aware of what air in the system will do?

Know how to get it out?

Don't think you need to replace bleed nipples when you've cracked them off?

[Ben Lessani]

Not sure how its possible to get air in the system changing pads.

Just lever the piston back in, don't bother removing the reservoir cap and loosening the nipple unless you are having too much difficulty.

[thai-wronghorse]

As mentioned, the reason behind removing the reservoir cap and slightly undoing the bleed nipple is to reduce the risk of deforming the master cylinder diaphragm valve. Air shouldn't enter the system as long as the brake peddle or handbrake isn't depressed, just wind the piston back carefully and do the nipple and cap back up. Bob's ya uncle!

[Diamond Hell]

Not sure how its possible to get air in the system changing pads.

It happens - I've seen it myself with my very own eyes.  All it takes is you releasing the pressure after it's pushed in, for the seals to allow some air past, especially on the rough end of the piston, which is normally exposed.

[danny_p]

i allways bleed brakes when changing pads,    it's pritty much garanteed the fluid in the calipers has been cooked at some point  even if air hasent got in so i allways let a at least a guestimated calliper full of fluid out.

[AudiA8Quattro]

I've never changed the fluid when changing pads, and never had a problem. I've also changed alot of pads in my time, i don't loosen the bleed nipple, just remove the cap off the master cylinder reservoir.
I change the fluid once every two years as of service schedule, unless any other problems occur in between.

[Paul86S2]

Get a friend who knows what they're doing to give you a hand. At least to tell you what to do whilst you do it.

Brakes are a very important part of yours and others safety, you really don't want to mess them up.

Paul

[danny_p]

I've never changed the fluid when changing pads, and never had a problem. I've also changed alot of pads in my time, i don't loosen the bleed nipple, just remove the cap off the master cylinder reservoir.
I change the fluid once every two years as of service schedule, unless any other problems occur in between.

probaly depends what the car is used for.  i've normaly faded the brakes a few times when it comes round to pad changeing

[AudiA8Quattro]

I've never changed the fluid when changing pads, and never had a problem. I've also changed alot of pads in my time, i don't loosen the bleed nipple, just remove the cap off the master cylinder reservoir.
I change the fluid once every two years as of service schedule, unless any other problems occur in between.

probaly depends what the car is used for.  i've normaly faded the brakes a few times when it comes round to pad changeing

All the cars i work on are just for road use, family, friends, work colleagues etc..
and my own cars.
I suppose on a track car it would certainly be worth changing the fluid when changing the pads.