2000 Z3 Roadster 2.8 5Sp with DSC, 55000 Miles
Lately I've been experiencing some issue with the brakes,
The brake pedal will act as it should most of the time, but sometime it will travel farther to the floor (not all the way to bottom out, but deeper than usual), mostly happen under moderate braking. If I release it and brake again the pedal feel normal and the travelling distance is back as usual, the brakes will work as intended and ramdomely the same happen again.
The reservoir stay full, don't see any leaks.
I'm thinking damaged/internaly leaking master, but would like advice.
Also looking at the part replacement, the part # listed for the 2000 is 34311163711, but mine as DSC, so shouldit be #34316754048?
Maybe you have old soft rubber brake lines that expand. Takes that second pump to pressurize the lines.
Last edited by Vintage42; 07-16-2018 at 06:33 AM.
BMW MOA 696, BMW CCA 1405
The cheapest thing to try is to just bleed the brake system. Maybe you have an air pocket somewhere?
You may have already done this quick easy test: With engine off, push as hard as you can on the brake pedal for over 30 seconds. It will initially give to a point and then stop. If it continues to sink after that, the master cylinder is bad. If it passes that test, I'd bleed the whole system.
Bleed the system, and if it hasn't been done every couple of years,
flush the entire system, to clear all contaminants.
My bet is that the pads or pad is getting kicked back under certain conditions. Given this is an intermittent problem I would think air or bad master would be more consistent. Check your wheel bearings and caliper bushings. Look at the pads. Are they even and flat?
Dan "PbFut" Rose
Did the pedal test and the pedal didn't seem to go any deeper.
Replaced the front pads a month ago, will do the rear one over the weekend and flush the system.
I am guessing the intermittent issue with your brakes showed up contemporaneous with your replacing the front pads. If so, one pad is likely hanging up on occasion and that is the cause. If indeed these events correlate, re-do the fronts and be sure to clean and lubricate everything.
Issue was happening before replacing the front pads and was hopping the switch was going to remedy it
But will take them out again when I do the back and check everything again.
Thanks everyone for all the suggestions
Last edited by wildspeed; 07-17-2018 at 08:59 AM.
Finally got around to have the brake fluid flush, situation did improve a lot. ( but still feel a little spongy time to time)
Didn't get a chance to replace the rear pads, been busy fixing electric/electronic equipments around the house after a direct lighting hit...
Late update.
Master cylinder failure.
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