ur Brake problem

Stu · 05-05-14, 08:07 PM

Hi all,
Me again! I have been doing a service on the ur, including the brakes. I have replaced the rear calipers with refurbed 20v & disks/pads, also the front calipers I have refurbiished with a new seal kit sliders/ new pads and disks, new brake fluid.
Before I started, taking it to its mot, (after being in storage for 6 months) I was forced to apply the brakes quite hard due to traffic coming to an abrupt stop.
Since then, I have the " Attention, brake system defective" warning, the brakes still work ok, albeit a little spongy today until all 4 brakes bed in.

Thanks for advice

john johnson · 05-05-14, 08:09 PM

Fluid level ok ? Can't remember if that's a warning for that too

Stu · 05-05-14, 08:27 PM

yes, fluid been replaced John

Hanuman · 05-05-14, 08:37 PM

Please check brake fluid- level switch, I believe.

Attention! Brake system defective- pressure switch on the brake hydraulic assembly. There's 2 switches. One for system pressure, and one for circuit pressure. Dirty switch connections can create a warning.
Would bleeding the brakes again help? Possibly. It wouldn't hurt, but maybe irrelevant.

On the V8, I get a red flashing warning light, and on the UR, have had an aural brake warning, following an emergency stop (ABS kicking in) Always, it's disappeared in normal driving, even with heavy braking.

Stu · 05-05-14, 08:42 PM

Quote:

Originally Posted by The Real MSH!

Attention! Brake system defective- pressure switch on the brake hydraulic assembly. There's 2 switches. One for system pressure, and one for circuit pressure. Dirty switch connections can create a warning.

Thanks, will check them and clean

Quote:

Originally Posted by The Real MSH!

Would bleeding the brakes again help? Possibly. It wouldn't hurt, but maybe irrelevant.

It was happening before I worked on the brakes, (I have bled 4 litres of new brake fluid through the lines to make sure! I cant believe how dirty the old stuff was!)

The amber warning triangle is constantly on as well

john johnson · 05-05-14, 08:54 PM

Is the wire damaadged on the float

Stu · 05-05-14, 09:18 PM

ok I will check that as well John

Thanks both

Stu · 05-05-14, 09:50 PM

Just went to the garage to check what was suggested, I took off the 2 spade connectors on the top of brake fluid reservoir, gave them a wire wool clean, and no more warning! so it was a dodgy contact, thanks

john johnson · 05-05-14, 10:24 PM

I did wonder .... Had it on one of mine before

05-05-14, 08:09 PM	#2
john johnson Moderator of sausages Classic Audi Club Member Join Date: Sep 2008 Location: sheffield Posts: 13,331	Fluid level ok ? Can't remember if that's a warning for that too __________________ Mr OCD http://s159.photobucket.com/albums/t144/jsquatts/ Daily rs4 b7 with buckets that play havoc with my piles And if you are reading this as James may would say ' you're a cock '

05-05-14, 08:37 PM	#4
Hanuman Trickster Classic Audi Club Member Join Date: May 2009 Location: Heckling from the cheap seats, Phnom Penh, KoW Posts: 7,006	Please check brake fluid- level switch, I believe. Attention! Brake system defective- pressure switch on the brake hydraulic assembly. There's 2 switches. One for system pressure, and one for circuit pressure. Dirty switch connections can create a warning. Would bleeding the brakes again help? Possibly. It wouldn't hurt, but maybe irrelevant. On the V8, I get a red flashing warning light, and on the UR, have had an aural brake warning, following an emergency stop (ABS kicking in) Always, it's disappeared in normal driving, even with heavy braking. __________________ I wish they would keep the damned Chinese away now that I can go home, so that I can enjoy Fish amok and a draught Angkor

05-05-14, 08:54 PM	#6
john johnson Moderator of sausages Classic Audi Club Member Join Date: Sep 2008 Location: sheffield Posts: 13,331	Is the wire damaadged on the float __________________ Mr OCD http://s159.photobucket.com/albums/t144/jsquatts/ Daily rs4 b7 with buckets that play havoc with my piles And if you are reading this as James may would say ' you're a cock '

05-05-14, 10:24 PM	#9
john johnson Moderator of sausages Classic Audi Club Member Join Date: Sep 2008 Location: sheffield Posts: 13,331	I did wonder .... Had it on one of mine before __________________ Mr OCD http://s159.photobucket.com/albums/t144/jsquatts/ Daily rs4 b7 with buckets that play havoc with my piles And if you are reading this as James may would say ' you're a cock '

05-05-14, 08:27 PM	#3
Stu Grown up member Classic Audi Club Member Join Date: May 2013 Posts: 159	yes, fluid been replaced John

05-05-14, 09:18 PM	#7
Stu Grown up member Classic Audi Club Member Join Date: May 2013 Posts: 159	ok I will check that as well John Thanks both

05-05-14, 09:50 PM	#8
Stu Grown up member Classic Audi Club Member Join Date: May 2013 Posts: 159	Just went to the garage to check what was suggested, I took off the 2 spade connectors on the top of brake fluid reservoir, gave them a wire wool clean, and no more warning! so it was a dodgy contact, thanks