I noticed the pads on the rear brakes were getting worn, so I bought new ones and installed them. Pretty straight forward - didn't have any problems. Bled the rear and front brakes and flushed the brake fluid with new DOT 4 till it ran clear. No bubbles.
Everything is fine till the test drive. Had nice firm rear brake pedal... until I didn't. It went from hard to all the way down with no stopping power. Pumped the pedal and had some brakes again. Went home and re-bled everything front and back. Ran almost a whole bottle of new clean brake fluid through. Another test drive. Worked great. Till later that afternoon. Again - sometimes the brake pedal would go all the eay down and other times it would be rock hard and work well.
I've never seen brakes work inconsistently before. Thoughts? I plan on rebuilding the master cylinder, but it seems mighty coincidental that it only began this issue after changing out the pads. (I even bought and used genuine Honda brake pads).
One thing I did, which might have caused a problem is I simply pressed the pistons into the caliper when installing the new pads. I have since read that a better way to do it is to release the pressure at the bleeder valve when pushing th piston back in. Maybe the back pressure caused an issue with the seals in the master? But the inconsistency has me puzzled.
Everything is fine till the test drive. Had nice firm rear brake pedal... until I didn't. It went from hard to all the way down with no stopping power. Pumped the pedal and had some brakes again. Went home and re-bled everything front and back. Ran almost a whole bottle of new clean brake fluid through. Another test drive. Worked great. Till later that afternoon. Again - sometimes the brake pedal would go all the eay down and other times it would be rock hard and work well.
I've never seen brakes work inconsistently before. Thoughts? I plan on rebuilding the master cylinder, but it seems mighty coincidental that it only began this issue after changing out the pads. (I even bought and used genuine Honda brake pads).
One thing I did, which might have caused a problem is I simply pressed the pistons into the caliper when installing the new pads. I have since read that a better way to do it is to release the pressure at the bleeder valve when pushing th piston back in. Maybe the back pressure caused an issue with the seals in the master? But the inconsistency has me puzzled.