Ask an Expert..... » Sinking brake pedal L200 (2005)

#1 by Mikexx , Fri Jul 25, 2025 5:12 pm

So far:

1) New Master Cylinder - same problem
2) Changed ABS pump. No change.
3) Capped the Master Cylinder with 10mm modified bleed nipples/screws. Pedal hard and no sinking.
4) Replaced rear circuit (front on Master Cylinder) and pedal hard and doesn't sink.
5) Replaced side bleed screw with second union. Pedal now sinks as before.
6) Checked front calipers. Pushed pistons back into body on both sides. Moved freely using a tool. Sinking returned straight away after pumping the pads in contact with the disc.

I wondered if the issue could be flexible brake hoses but given the front caliper cylinders move back I don't think so.

Fluid level does not drop over time.

Still wondering the Master cylinder but two with still the same symptoms.

Any suggestions gratefully received.

#2 by 123hotchef , Thu Jul 31, 2025 9:19 pm

are the flexxxies original?

#3 by Mikexx , Thu Jul 31, 2025 10:30 pm

Quote: 123hotchef wrote in post #2
are the flexxxies original?

Yes, they must be 20 years old. Would they give a sinking like effect?

Like expand gracefully over time and then immediately go back into shape?

#4 by 123hotchef , Fri Aug 01, 2025 9:02 pm

they might yes, they an also break down and act as one way valves best replace all the flexxxies too

Posts:	21
Date registered	08.10.2016

Posts:	34.256
Date registered	02.15.2012

Posts:	21
Date registered	08.10.2016

Posts:	34.256
Date registered	02.15.2012

Sinking brake pedal L200 (2005)

RE: Sinking brake pedal L200 (2005)

RE: Sinking brake pedal L200 (2005)

RE: Sinking brake pedal L200 (2005)