Should you loosen bleeder screw when changing brake pads?

Just curious. Some sites say to do it, others don%26#039;t.|||Mike C has the right answer. ABS can be a nightmare to bleed if you allow back pressue in|||If you have abs you need to loosen the bleeder. Otherwise it is ok to just remove the master cylinder cap to depress piston.|||No don%26#039;t do it, push the calipers back (sometimes I have to use a C clamp,) then put your pads on. Unless you want air in the lines and bleed them.|||Unless you car requires this specific operation do not loosen the bleeder screw as you may allow air into the brake line.





If anything, loosen the cap for the brake fluid reservoir as the fluid will move a bit when you compress the caliper pistons to allow space for the new pads.|||You stand a better chance of getting air in the line doing that. When you use a clamp to press the caliper open to make room for the new pads will force the fluid back to the master cylinder reservoir.





You want to slowly press the caliper open as you do it.|||If you are just changing pads, No leave it alone. Unless there is air in your brake lines there is no need to bleed them. an argument can be made that bleeding the lines and purging old possibly contaminated fluid from the system may prolong component life, but without the proper tools %26amp; experience you will only end up costing yourself more money in broken parts|||There is no need to open the bleeder screw. Do as the other have stated and compress the calipers with a c-clamp and insert the new pads.








If you are doing work on your car I would recommend getting the manual.|||Yes especially if you have abs.brakes. you have to be very careful when removing the master cylinder cap to push the pads in,because if you have taken your car for servicing( oil change) some times they will will add to all necessary Fluid to the car. there for if you don%26#039;t open the bleeder you can cause three problem first you can knock the timing of the abs motor out which will require a trained tech. two you can cause the proportionary valve to stick due to the Fluid being forced backwards through it.third if you take the cap off and brake Fluid gets on the paint,and it not removed it will damage the paint and body of the body panels|||I never have and I have changed pads a lot.|||No !!! Just push the pistons back into the caliper, watch master cylinder reservoir, so you don%26#039;t have brake fluid running out. you may have to take some of the fluid out of the reservoir, so it isn%26#039;t overfull.|||no you don,t ! just take off the master cylinder lid off and take a c-clamp and run the piston all the way in.if anytime you loosen the bleeder your going to get air in it.|||never--------remove the master cylinder cap during installation|||I have changed pads on my 2002 VW Jetta with ABS and I have never loosen the bleeder. But one time I did change a caliper so I have the bleed the system anyway. This is the first time I hear about it