If both pads and discs are new then do 20 to 30 hard stops to de bur the discs, let them cool by just driving then start breaking from high speed repeatedly untill you get brake fade. Do not stop...
I have a 2007 3i sport, 62k miles, original pads and rotors, all in good shape. Friday afternoon I'm pulling into my driveway for lunch, and my brake pedal goes soft. Brakes still engage after some travel in the pedal, but nothing like before when it was pretty much immediately responsive.
Aug 09, 2019 · Problem: The truck came in with a brake pedal that seemed to be bypassing to the halfway point. Needed brakes and replaced all pads rotors and calipers. Front calipers are fixed four pistons. Pressure bled the system. Plug the master cylinder, Pedal was good. Changed the master cylinder anyway, made no difference.
spongy brake pedal after new discs/pads ... just bled the brakes today. they are still a little spongy but SO much better. one of the lines (the front left) let a big ...
Jul 16, 2014 · It was time for a brake flush anyway so I used my "motive" power bleeder to flush and bleed the whole system and fill it with fresh DOT4. No change, no improvement. At this point I had four new rotors, all new pads, flushed and bled fluid and a horrible pedal. And it only went bad after my brake job.
The other reason new pads feel soft is that they still have all the gases in them from the adhesive used to form the material and stick it onto a backing plate. These gases come out when the brakes heat up and will take a few heat cycles to full dissipate. These gases make the pads perform less than optimally.
Air in the system makes them feel soft and spongy. Replace the fluid if you must, but my bet is on an air bubble or two. it doesn't take much!
A metallic squeak when you brake could mean the brake pads are worn out and the metal backing is scraping on the disc. This can score the discs and seriously affect brake performance. It’s most likely because the brakes weren’t serviced but it could be a sticking piston in a caliper pushing the pad against the disc.
Hey this is Pete, if you want a good pedal after replacing faulty part, bleed system, & then still have a spongy pedal this is what you should try, take the vehicle to a gravel road, drive the vehicle in a safe area where you can slide the wheels in a quick/ panic type stop, this will reset a.b.s. module out of line mode.