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Braking issue
- thecremeegg
- Member
- Posts: 733
- Joined: Sat Jan 23, 2016 11:43 am
- Location: North Hampshire
Braking issue
So I took my E85 out for a drive a few weeks back and thought the brakes felt a bit spongey.
The other day I go in it to move it and the brake pedal goes to the floor. I also have one error light, the yellow triangle with a circle round it.
If I pump the pedal then nothing happens, it still goes to the floor.
Brake fluid is on low but still has fluid in it.
I've scanned the car with Carly as I've managed to lose my proper cable for the BMW software, and I've got the following errors:
Could anyone advise if I'm correct when I say it's likely a master cylinder rather than an ABS pump issue? I've ordered a used master cylinder off ebay but if it's something else it would be good to know?
Thanks
The other day I go in it to move it and the brake pedal goes to the floor. I also have one error light, the yellow triangle with a circle round it.
If I pump the pedal then nothing happens, it still goes to the floor.
Brake fluid is on low but still has fluid in it.
I've scanned the car with Carly as I've managed to lose my proper cable for the BMW software, and I've got the following errors:
Could anyone advise if I'm correct when I say it's likely a master cylinder rather than an ABS pump issue? I've ordered a used master cylinder off ebay but if it's something else it would be good to know?
Thanks
- enuff_zed
- Lifer
- Posts: 14385
- Joined: Wed Oct 26, 2016 11:05 am
- Location: Attleborough, Norfolk
Braking issue
If brake fluid is on low I would suggest you have a leak. If it's not a visible one anywhere then potentially back into the servo.
However, it could be that the pads have worn a lot and you've only now had cause to check the level.
If it is too low then that will upset the pressure sensors and possibly give spurious other codes.
Can't remember on the zed but a lot of cars have a diagonal split on the feeds from the reservoir in case a leak occurs in one corner. This could maybe explain why you have mention of front left and rear right?
As a very quick check you could fill up the fluid and see what happens but I suspect there is already a lot of air in the system now so you'd need to bleed it as well.
However, it could be that the pads have worn a lot and you've only now had cause to check the level.
If it is too low then that will upset the pressure sensors and possibly give spurious other codes.
Can't remember on the zed but a lot of cars have a diagonal split on the feeds from the reservoir in case a leak occurs in one corner. This could maybe explain why you have mention of front left and rear right?
As a very quick check you could fill up the fluid and see what happens but I suspect there is already a lot of air in the system now so you'd need to bleed it as well.
- thecremeegg
- Member
- Posts: 733
- Joined: Sat Jan 23, 2016 11:43 am
- Location: North Hampshire
Braking issue
Hmm yea it's hard to see any leaks on the floor, but the fact it's gone down I guess is likely indicative it's going somewhere! Pads haven't worn much, it's only done about 1000 miles in 3 years. I'm going to probably replace the master cylinder, bleed it and see what happens
- colb
- Senior Member
- Posts: 1623
- Joined: Wed Nov 13, 2019 9:45 pm
- Location: Newport, South Wales UK
Braking issue
Brake fluid is going somewhere if no leaks from the lines then suspect and investigate the master cylinder, fluid might be getting into the brake servo. Really sounds like the seals in the master have given up so replacement probably the way to go rather than just renew the seals in the master cylinder. The Brake pressure sensors have set codes due to low pressure I would suspect, they do fail and set codes if they do go wrong. Creator 310+ Scanner can monitor them in live data. I had one fail and set a code, replaced it with a new unit from ebay which solved it.
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1999 1.8 Z3
2003 2.5 Z4
1998 Honda Deauville 650
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1999 1.8 Z3
2003 2.5 Z4
1998 Honda Deauville 650
If the forum helped you, why not help the forum back. Thats the Z4 way!
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- Rockhopper
- Senior Member
- Posts: 1099
- Joined: Fri Mar 06, 2020 7:05 pm
- Location: Mansfield
Braking issue
Mine had a leak from the pipe running over the petrol tank, no drips on the floor or nothing obvious but that's where it was.
- thecremeegg
- Member
- Posts: 733
- Joined: Sat Jan 23, 2016 11:43 am
- Location: North Hampshire
Braking issue
Interesting, thanks.Rockhopper wrote: ↑Wed Mar 01, 2023 11:08 am Mine had a leak from the pipe running over the petrol tank, no drips on the floor or nothing obvious but that's where it was.
Yea I'm going to swap it and see what happens, fingers crossed!colb wrote: ↑Wed Mar 01, 2023 12:07 am Brake fluid is going somewhere if no leaks from the lines then suspect and investigate the master cylinder, fluid might be getting into the brake servo. Really sounds like the seals in the master have given up so replacement probably the way to go rather than just renew the seals in the master cylinder. The Brake pressure sensors have set codes due to low pressure I would suspect, they do fail and set codes if they do go wrong. Creator 310+ Scanner can monitor them in live data. I had one fail and set a code, replaced it with a new unit from ebay which solved it.
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- Lifer
- Posts: 11026
- Joined: Tue Feb 10, 2015 10:27 pm
Braking issue
Comprehensive answer, my initial thoughts too.colb wrote: ↑Wed Mar 01, 2023 12:07 am Brake fluid is going somewhere if no leaks from the lines then suspect and investigate the master cylinder, fluid might be getting into the brake servo. Really sounds like the seals in the master have given up so replacement probably the way to go rather than just renew the seals in the master cylinder. The Brake pressure sensors have set codes due to low pressure I would suspect, they do fail and set codes if they do go wrong. Creator 310+ Scanner can monitor them in live data. I had one fail and set a code, replaced it with a new unit from ebay which solved it.
M roady...OEM CSL’s, strut brace, Remus back boxes, ZHP
MR2 MK 2
E89 35i project car...mapped 365bhp, M4 stoppers & wheels, KWV3’s, H&R front ARB, M3 front arms, strut brace Eisenmann cat back race exhaust, VRSF downpipes inbound
E89 35is
G29
MR2 MK 2
E89 35i project car...mapped 365bhp, M4 stoppers & wheels, KWV3’s, H&R front ARB, M3 front arms, strut brace Eisenmann cat back race exhaust, VRSF downpipes inbound
E89 35is
G29
- thecremeegg
- Member
- Posts: 733
- Joined: Sat Jan 23, 2016 11:43 am
- Location: North Hampshire
Braking issue
So the problem has been diagnosed as one of the rear brake lines failing. They've been mentioned on the last few MOTs but the car does so few miles of late and has had a few big issues that I've had to sort, I never got round to sorting them!
Rather annoying as I wanted to take it to Mike at Zed Shed as he'll do front and back for £250 all in, however I can't get the car there now without paying a fortune for transport!
Anyone down here in Hampshire that can do them for me?
Rather annoying as I wanted to take it to Mike at Zed Shed as he'll do front and back for £250 all in, however I can't get the car there now without paying a fortune for transport!
Anyone down here in Hampshire that can do them for me?
- enuff_zed
- Lifer
- Posts: 14385
- Joined: Wed Oct 26, 2016 11:05 am
- Location: Attleborough, Norfolk
Braking issue
I suppose the logical answer is Ross at RBM in Hook.thecremeegg wrote: ↑Wed Mar 15, 2023 11:47 am So the problem has been diagnosed as one of the rear brake lines failing. They've been mentioned on the last few MOTs but the car does so few miles of late and has had a few big issues that I've had to sort, I never got round to sorting them!
Rather annoying as I wanted to take it to Mike at Zed Shed as he'll do front and back for £250 all in, however I can't get the car there now without paying a fortune for transport!
Anyone down here in Hampshire that can do them for me?
- thecremeegg
- Member
- Posts: 733
- Joined: Sat Jan 23, 2016 11:43 am
- Location: North Hampshire
Braking issue
Yea but he wants to charge £500 which is a rip off. Every time I've tried to get anything from RBM they either say they can't do it or want to charge a fortune
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- Lifer
- Posts: 3296
- Joined: Tue Sep 29, 2020 10:37 pm
- Location: North Hampshire
Braking issue
Do you know exactly what’s failing and where? Can you see it?
2003 Maldives Blue 3.0i auto
Previously: Maldives Blue 2.5i manual (its back!) and another, and a Monaco Blue 3.0Si coupe
Previously: Maldives Blue 2.5i manual (its back!) and another, and a Monaco Blue 3.0Si coupe
- thecremeegg
- Member
- Posts: 733
- Joined: Sat Jan 23, 2016 11:43 am
- Location: North Hampshire
Braking issue
I don't know as I haven't been to the garage yet as away with work, but they've said one of the rear brake lines has a leak in it.
I was actually booked in next month to drive the car to Zed Shed, so obviously it breaks now lol!
I was actually booked in next month to drive the car to Zed Shed, so obviously it breaks now lol!