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Brake issue? Maybe?...

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Old Jul 3rd, 2019, 23:30   #1
Davehaynes1
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Default Brake issue? Maybe?...

Hi all.

So I've just taken my 1999 v40 in for a wof (NZ equivalent to an mot)

Picked the car up to find out it had failed due to excessive brake travel.

After speaking with the women who did the test she said yeah, there is too much travel in the pedal.

I replied that brake pedal travel is very subjective.
She said the front pads were very low so I will change these, can't see that having much impact on pedal travel but oh well.

She then went on to say that their brake rollers were showing the fronts at 300 and rears at only 100 under full brake.
Not sure what these numbers are but she seems sure the rears are not working properly.

I will also try bleeding all 4 corners.

Any other suggestions?

Thanks!!
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Old Jul 3rd, 2019, 23:42   #2
Dippydog
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I don't know what numbers you need to be seeing but make sure calipers are free to move on their sliding pins and that the pistons are not sticking in the calipers also make sure the pads aren't getting "hung up" in the calipers.The numbers for your fronts sound ok to me with maybe the rears needing to be a bit higher?
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Old Jul 4th, 2019, 08:40   #3
clarkey1984
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I would always expect uneven braking effort from front to back as the fronts are physically larger, under heavy braking the front of the car tends to be loaded up with inertia while the rear goes light, so an even 50/50 would see the back end breaking away easily, so far as I know it's always been around a 70/30 split or thereabouts.
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Old Jul 4th, 2019, 11:29   #4
difflock54
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I have a 2002 V40.
Just looked at my last VTNZ check sheet from the last WOF.
My front readings were 330. The rears were 160 left 145 right.
passed without issues.
I also found an older check sheet where they advised that the front pads were getting low and soon due for replacement. Those front readings were still 330.

One seems to get variations up or down at every inspection.
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Old Jul 4th, 2019, 14:41   #5
Clan
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Quote:
Originally Posted by Davehaynes1 View Post
Hi all.

So I've just taken my 1999 v40 in for a wof (NZ equivalent to an mot)

Picked the car up to find out it had failed due to excessive brake travel.

After speaking with the women who did the test she said yeah, there is too much travel in the pedal.

I replied that brake pedal travel is very subjective.
She said the front pads were very low so I will change these, can't see that having much impact on pedal travel but oh well.

She then went on to say that their brake rollers were showing the fronts at 300 and rears at only 100 under full brake.
Not sure what these numbers are but she seems sure the rears are not working properly.

I will also try bleeding all 4 corners.

Any other suggestions?

Thanks!!
it is not uncommon for the brake pads to seize in their holders , they could do with a file on the mating surfaces , also pistons can stick after all this time ... 100 and 400 kg of braking force is not unusual
a soft pedal can be caused when just one pad is seized as the one moving pad bends the disc over to meet the seized pad .
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Old Jul 4th, 2019, 20:32   #6
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I would be inclined to strip the rears and clean up all of the surfaces. Coppa slip the moving pins and surfaces. Reassemble and REALLY adjust up the auto adjusters with a full brake pedal application and LARGE movements of the handbrake. Get out and check the free movement of the wheel. Pull the handbrake up one click at a time and see which one bites first. Using a wheel brace, try to turn the wheel with each notch on the hand brake.

Assuming there is a load sensing valve fitted in your market....bung a load of weight in the back (100kg) that ought to bring the effort up!
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Old Jul 11th, 2019, 09:29   #7
Davehaynes1
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Hi.

Sorry for the long delay... have been looking into this and trying to read up!!

So i got the new front pads in, bled the 4 corners.
I got a very very small amount of teeny tiinyy bubbles out of the rear right caliper but thats about all. fluid was a very nasty milky colour.....
Calipers were in great shape, pistons slid back in nice and easy just by hand. rears seems great condition too!

Anyway, no real difference so took it back to the testing station.
He was still not happy so took it to a place i know and had him check it out.

the guy at the garage seems to think its a problem with the master cylinder but im hesitant to change as i have read alot online of people with the same issue who have replaced the master cylinder to no avail.

Note : This vehicle only has 46,xxxkm!!! But is a 1999 so could have knackered seals in the master i guess??

I have ordered a new master anyway (NEARLY $400/£200) and just hope it fixes it i guess!!


Any good walk throughs i can follow?? only ones i can find are for the v70 or the newer v40....
And anything else i can do at the same time??
Also i guess anything else to check if this doesnt sort the issue?

Thanks fellas!
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Old Jul 11th, 2019, 23:03   #8
bobthecabbage
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Do the handbrake levers on the callipers rest on or very close to the stops?
I used to find a steep hill and do some harsh braking to get the rear brakes to adjust up for the brake test (handbrake mainly).
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Old Dec 9th, 2019, 17:45   #9
bobthecabbage
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I see i was last to post on this thread but just to refresh...

Brake travel was a bit long/soft, also got abs going down a road that wasn't that slippy and brakes were not that effective

Anyway, did a few 'urgent' stops going down hill at 20 miles an hour in order to provoke the abs, now the brake pedal is a lot firmer, bites higher up and car stops a fair bit better.

Moral of the story, if you drive like a granny/economically like I do, you need to 'exercise' the brakes on a nice damp hill by giving them a firm push and repeat two or three times in order to maintain proper adjustment.

My brakes do probably need a winter service/inspection but I do keep an eye on them so they are unlikely to be seized or in need of greasing.
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