Someone recently had the above - both yellow and red lights on, and pump completely switched off - probably an electrical fix (ie relays)

Cant find the thread!

Anyone recall this?

JJ

*UPDATE* Problem provisionally solved - replaced relay under dash, and all appears well again.

 

To add,

On the cos last night, yellow light and red light came on. Braking fine for a while, and eventually lost all braking.

Noted when turning engine off then back to key position 2, the brake pump was not charging.

Looked at relays behind glove box, and after a fiddle, the pump on retest started to work again. I am thinking electrical. Does this sound like a dodgy relay to anyone?

JJ

 

brake pump

what?

 

Ive had it happen to me, but without the yellow lights on.
Lost power to the eletric servo it felt like, but ive been unable to find out why and its never done it again since.

 

cosworths have an electric servo

learn some thing every day

 

I am thinking that it must be a dodgy relay. Fortunately, mine is currently suffering from complete failure, and therefore will need to be addressed.

I thought maybe a burnt out pump, but given that it suddenly started working again (albeit briefly!) that makes me think relay.

I happen to have a set of spare relays, so I will swap them all and see if the prob goes away.

I am sure I saw a post on this recently, but I am absolutley buggered if I can find it!

JJ

 

Zippyobrien, they don't have servo's as such but a pressure accumlator to do the same job, looks like a sphere like on a citroen suspension system, ans stores pressurised fluid there pressure being produced by the pump.
This takes the place of the servo asistance, as there is not enough room for a packet of fags let alone a whacking great servo!!
tabetha

 

JJ, bin it and fit a bias pedal box

 

LOL - I like your thinking! Sounds like the way forward. Of course then I would probably end up mis-biassing the brakes, and crashing the fooking thing!

JJ

 

thats why you test them on an empty bit of road before doing a trackday lol

saying that, we had a Fez ST group N rally car last year, on the road the brakes were pretty good, and at brunters during a top speed effort i was leaving the braking later and later, and being a rally car it had a lot of rear bias but i had wound on a fair bit of front...


but i still managed to lock up the rear end at 120

foooooking shat myself as the grass bit was approaching fast, and i was 90 degrees tot he direction of travel lol

god know what happened but the car straightened up and i didnt die

 

jj, i had a similar issue with mine ,so i re wired the system ,similar idea to the fuel pump re wire!

i can do it for you if you like, and we can make the abs switchable

 

Hi matey - good news is that I appear to have sorted it. I used one of my spare relays to replace one of the abs relays and it sprang into life! Hurrah!

Must be getting to that age when all the bits break! LOL

We should meet for a beer though if you fancy it? (just the one you understand)


Dan - 120 mph rear lock up sounds like fun! And also sounds like the thing I would end up doing! LOL

Lets see how long it works for this time!

JJ

 

Im down on Friday for a few days if you want to meet up ?

Steve.

 

could do it on friday, im going out with a few lads from work for a few bevs at about 5 ish in exeter somewhere...

its my last night of being a free man

 

Was asking JJ

Don't get too pissed lol

Steve.

 

i was answering jj too

 

Hi guys

cossie - Well up for that matey - let me know when. Sat night and sun night are absolute no - gos though as these are the only times Mrs is not working. Maybe a lunch drinkie?

JTech - fook me thats come around fast hasnt it! Where abouts are you gonna be on Fri? Ill see if I can pop along (notorious last words!)

JJ

 

Replace the fuse as well - was it the purple relay you replaced and was it new? I had exactly the same problem, except the relay was broken AND the fuse had melted - ended up cutting it out and fitting a new fuse holder.

 

Hi mate - I will replace fuse as well - good advice!

It was indeed the purple badger that was replaced - all seems well now.

JJ

 

I had the same fault on my car both lights stayed on n wud not go out. It was the fuse holder for the abs it was badly corroded it got cut out n a new 1 fitted. Been sweet ever since.

 

it could also be that the brake fluid is getting too hot
do you have a sheild around it?

when i had the same problem with my tt it always used to be because i was giving it plenty of welly, not really when you want the rbakes to fail but opening the bonnet and letting it cool down for 15 minutes turned the light off again

ended up having 5 layers of heat sheilding around the pump before it stopped doing it

 

Hi matey

No it was definately the relay - as soon as the relay was replaced it instantly started working again - connectors all looked to be in good order. Also, heat shield is present and correct.

Since the relay has been changed, it has been faultless.

Hurrah!

JJ