Rear caliper low pressure

[dubster]

Hi chaps. My rear caliper seems to have suddenly gone a bit lazy.

Pistons still move but very weak and practically no stopping power.

Have already changed fluid, noticed black bits floating in there - am guessing from the hose that attaches to the master cylinder. Have ordered a new hose, but wondering whether crap has now entered the main system.

is there anything else that could be causing this?

 

[buellzebub]

Sounds like the hose has collapsed internally, one of my front ones did the same at 16 years old. And/or worn seals in the master cylinder?

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[dubster]

Sounds like the hose has collapsed internally, one of my front ones did the same at 16 years old. And/or worn seals in the master cylinder?

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Do you mean the rubber that sits in the cylinder cap? That looks OK in fact.

It's an adventure so has braided lines, except for the hose that connects to the master cylinder. Should I be worried there are bits of rubber crap in the abs system now?

 

[MikeO]

Do you mean the rubber that sits in the cylinder cap? That looks OK in fact.

It's an adventure so has braided lines, except for the hose that connects to the master cylinder. Should I be worried there are bits of rubber crap in the abs system now?

Braided lines still have rubber inners...

 

[buellzebub]

Do you mean the rubber that sits in the cylinder cap? That looks OK in fact.

It's an adventure so has braided lines, except for the hose that connects to the master cylinder. Should I be worried there are bits of rubber crap in the abs system now?

No, it was one of the lines running down to the caliper that collapsed on mine.
I don't have ABS myself but I would certainly be considering flushing the system through if I had.

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[West coast gser]

Braided lines still have rubber inners...

Wrong ..braided lines have teflon/ptfe inner ..

 

[dubster]

Just replace the rubber hose and do a normal flush then ?

 

[Steptoe]

Hi chaps. My rear caliper seems to have suddenly gone a bit lazy.

Pistons still move but very weak and practically no stopping power.

Have already changed fluid, noticed black bits floating in there - am guessing from the hose that attaches to the master cylinder. Have ordered a new hose, but wondering whether crap has now entered the main system.

is there anything else that could be causing this?

Which year, what type of brakes ? servo, non servo etc etc.

 

[dubster]

Which year, what type of brakes ? servo, non servo etc etc.

It's 2002 GSA non-servo ABS, the BMW marked calipers

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[dubster]

New hose fitted and bled her again, from the abs unit also this time. All back to normal

 

[MikeO]

Wrong ..braided lines have teflon/ptfe inner ..

But they can still degrade with age, right?