Intermittent random brake failure

BUDFORCE · 8 Apr 2019 at 13:40

So to update, I've decided to get rid of the car. Damn shame as otherwise it's a good car although the mileage is getting on about (110k) , mechanic ain't confident about the master cylinder or servo, nothing wrong with bearings discs everything is aligned.

I just cannot risk replacing parts without being sure it'll fix it, plus it's throwing money at it, which could be put towards a new one.

Sigh.....

jpaul · 8 Apr 2019 at 13:46

Malt_Vinegar said:
Had anyone actually bled the system since the brake work was done?

I didn't see either, if they had changed fluid ?

Malt_Vinegar · 8 Apr 2019 at 13:58

BUDFORCE said:
So to update, I've decided to get rid of the car. Damn shame as otherwise it's a good car although the mileage is getting on about (110k) , mechanic ain't confident about the master cylinder or servo, nothing wrong with bearings discs everything is aligned.

I just cannot risk replacing parts without being sure it'll fix it, plus it's throwing money at it, which could be put towards a new one.

Sigh.....

Bleed the system?? Please tell me the mechanic has tried that... Its the cost of some fluid and 30 mins work!

tom_e · 8 Apr 2019 at 14:05

I'm not sure how bleeding the system would help? There's either air in it all the time or there isn't, it should be a sealed system so it's not like the air can hide and then pop up to cause issues once in a blue moon.

jpaul · 8 Apr 2019 at 14:12

I'd thought it could be boiling , he did say something about 90, was it, no ? , necessitating a complete change

BUDFORCE · 8 Apr 2019 at 15:11

Yea it's a sealed system, air wouldn't cause something like this, plus over time it'll tend to work it's way to the top, the brakes work completely fine, until the two times they failed then it completely failed, with probably 500 miles of completely problem free braking in between.

jpaul · 8 Apr 2019 at 15:58

with less obfuscation .. The brake fluid boil test with Edd China

BUDFORCE · 8 Apr 2019 at 16:11

Yea so he said it himself, after lots of braking the fluid heats up, both times this happened I was cruising on the motorway and hadn't been using my brakes beforehand, both times the second pump returned full pressure.

I have been driving my car and being more intensive on the brakes between and all fine, if it were boiling fluid/air this would happen in between under braking, it would also happen to varying degrees depending on how got it got, not join at go from working 100% then complete failure, then back again.

Anyway, might stick the car on eBay under spares and repairs, I could never sell it without making it clear about the fault.