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Author Topic: Brake fluid change - MOT fail?  (Read 1086 times)

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Bigron

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Re: Brake fluid change - MOT fail?
« Reply #15 on: 08 May 2019, 11:24:56 »

I'm not sure about in the new, more stringent MOT regulations, but even under the old ones it would be covered by overall braking efficiency. No specific requirement to check the fluid, but if that tester found the brake test results to be marginal, then all credit to him for checking the fluid - he is on the OP's side! :y

Ron.
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Raeturbo

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Re: Brake fluid change - MOT fail?
« Reply #16 on: 08 May 2019, 11:26:10 »


Changes to testable items and defects from 20 May

There's a major overhaul of the MOT testers' manual that came in at the same time as the new defect categories.

There's a long list of changes with some new checks added, some existing checks updated and a few failure items removed.  Changes include:


New items

Brake fluid contamination
Daytime running lights
Front fog lights
Reversing lamps
Light source and lamp not compatible - Halogen headlamps converted for HID bulbs will fail
Vehicle Identification Number (VIN) obviously falsified
Brake lining or pad wear indicator illuminated
Engine malfunction indicator lamp
Exhaust gas recirculation valve
NOx sensor
Evidence that a Diesel Particulate Filter (DPF) has been tampered with
Any visible smoke from a vehicle with DPF
Stricter limits for emissions from diesels with a DPF
Fluid leaks other than coolant and Adblue
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Raeturbo

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Re: Brake fluid change - MOT fail?
« Reply #17 on: 08 May 2019, 11:32:20 »

However the mot tester is not allowed to dismantle anything... would taking the cap off be dismantling?..   Brakes were probably crap on the rollers so he checked the fluid itís very hydroscopic and the higher the dot dot 4 dot 5 the more it is. Remember the days of dot3.
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raywilb

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Re: Brake fluid change - MOT fail?
« Reply #18 on: 08 May 2019, 11:33:05 »

 do i,-  if i was to change the fluid on my omega do i just open the bleed nipple at the furthest from the reservoir & wait till clean fluid comes through ?? mine is in for its m.o.t at the mo.

 

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Nick W

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Re: Brake fluid change - MOT fail?
« Reply #19 on: 08 May 2019, 12:15:09 »

You need to replace the fluid in lines and calipers, so you have to bleed each nipple until you get fresh fluid at them all. In this case, I would start at the closest and work round ensuring that the reservoir never runs dry.
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dave the builder

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Re: Brake fluid change - MOT fail?
« Reply #20 on: 08 May 2019, 12:25:10 »

The new MOT testable items have been in effect since may last year , so nearly 12 months, and was well publicized long before it came into effect .

some items do not apply across the board , eg , reversing lights on vehicles first used from 1 September 2009
Headlamp washers tested on vehicles first used on or after 1 September 2009
daytime running lights on vehicles first used from 1 March 2018

another item that has been testable for a while is trailer wiring ,however there is no standard for 7 pin socket wiring , so only 13 pin plugs should be tested for operation
(but all can fail on dangerous wiring etc)

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raywilb

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Re: Brake fluid change - MOT fail?
« Reply #21 on: 08 May 2019, 12:27:28 »

You need to replace the fluid in lines and calipers, so you have to bleed each nipple until you get fresh fluid at them all. In this case, I would start at the closest and work round ensuring that the reservoir never runs dry.
ok thanks . not been done for since dont know when.
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Fuse 19

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Re: Brake fluid change - MOT fail?
« Reply #22 on: 08 May 2019, 12:28:29 »

They don't physically test the brake fluid, its inspection only.

AA, what was the exact failure reference code, it may have been for a braking issue and they are proposing a fluid change may fix it.

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dave the builder

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Re: Brake fluid change - MOT fail?
« Reply #23 on: 08 May 2019, 12:47:46 »

You need to replace the fluid in lines and calipers, so you have to bleed each nipple until you get fresh fluid at them all. In this case, I would start at the closest and work round ensuring that the reservoir never runs dry.
ok thanks . not been done for since dont know when.
I genuinely believe you will notice an improvement in pedal feel and braking when brake fluid is replaced  :y
(assuming the brakes are bled correctly and the calipers are free )
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terry paget

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Re: Brake fluid change - MOT fail?
« Reply #24 on: 08 May 2019, 13:49:19 »

I used to experience brake fluid boiling in my rallying days, the 1960s, have not known it since. Now I change the brake fluid because Vx advises it lest corrosion damages the ABS valves, though I have never heard of it happening.
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Raeturbo

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Re: Brake fluid change - MOT fail?
« Reply #25 on: 08 May 2019, 15:57:20 »

I used to experience brake fluid boiling in my rallying days, the 1960s, have not known it since. Now I change the brake fluid because Vx advises it lest corrosion damages the ABS valves, though I have never heard of it happening.
[/quote
               Yes, Iím using dot5 in the Evo in which I do a few track days and is a definite improvement, obviously Iím using racing pads too so the brakes get a lot hotter and need the higher spec fluid. As for the OP a simple bleeding of the brakes can only be of benefit, and you will know itís done for sure this time ::)
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raywilb

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Re: Brake fluid change - MOT fail?
« Reply #26 on: 08 May 2019, 16:28:59 »

do i,-  if i was to change the fluid on my omega do i just open the bleed nipple at the furthest from the reservoir & wait till clean fluid comes through ?? mine is in for its m.o.t at the mo.
i always did  empty the the oil pan fully via the sump plug.
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dave the builder

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Re: Brake fluid change - MOT fail?
« Reply #27 on: 08 May 2019, 16:48:03 »

do i,-  if i was to change the fluid on my omega do i just open the bleed nipple at the furthest from the reservoir & wait till clean fluid comes through ?? mine is in for its m.o.t at the mo.
i always did  empty the the oil pan fully via the sump plug.
won't help your brakes much  ;D
or are you posting in the wrong thread   :-\ :y
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Doctor Gollum

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Re: Brake fluid change - MOT fail?
« Reply #28 on: 08 May 2019, 16:58:07 »

do i,-  if i was to change the fluid on my omega do i just open the bleed nipple at the furthest from the reservoir & wait till clean fluid comes through ?? mine is in for its m.o.t at the mo.
i always did  empty the the oil pan fully via the sump plug.
won't help your brakes much  ;D
or are you posting in the wrong thread   :-\ :y
It's an age thing :D
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Kevin Wood

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Re: Brake fluid change - MOT fail?
« Reply #29 on: 08 May 2019, 17:05:18 »

I used to experience brake fluid boiling in my rallying days, the 1960s, have not known it since. Now I change the brake fluid because Vx advises it lest corrosion damages the ABS valves, though I have never heard of it happening.

It's not just the ABS valves but all seals and wet components in the system. Neglecting the fluid is a false economy, as you'll soon find yourself with leaking seals, rusting pistons and so on, even if your driving style doesn't regularly test the boiling point of the fluid. :y 

I tend to pull some fresh fluid through whatever branch of the system I'm working on whenever I'm changing the brake pads. I loosen the bleed nipple to expel the old fluid as I'm retracting the caliper piston, so it's little extra effort to hook up the eezibleed and squirt a bit of new fluid through*.


*- unless some muppet lets the eezibleed run out and fills the system with compressed air instead. :-[
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