Brakes

Archives of Posts to the NZ MX5 List back in 2006
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black93
Tentative sideways sliding....
Tentative sideways sliding....
Posts: 47
Joined: Sun May 21, 2006 3:40 pm
Location: Northland

Brakes

Post by black93 » Tue May 16, 2006 6:24 pm

Hi
It is with interest I note the conversation on oil, filters etc pre
Track Day. I have changed engine and gearbox oil new oil filter spark
plugs and fuel filter all the stuff to make it go faster/ not wear out.
Last of all I addressed the slow down fast issue. I replaced the break
fluid. Whilst doing this I was amazed at the amount of air in the
system. Every wheel brake cylinder had air in it, two of them a
considerable amount. Prior to this the break pedal felt firm, it is now
much better and certainly more effective.

On to Taupo

Terry
2003 cerion silver 03 SG

MadMaz
Need, more, 5-ing, time....
Need, more, 5-ing, time....
Posts: 100
Joined: Thu May 18, 2006 10:56 pm
Location: Pukekohe

Brakes

Post by MadMaz » Tue May 16, 2006 11:17 pm

Good call Terry

The condition of the brakes are paramount out on the track - and that means
the age and type of brake fluid and the condition of the brake pots, seals &
presence of vapour - usually caused by old brake fluid absorbing
water and then boiling away under temperature. Brake fluid is highly
hygroscopic & should be replaced annually - Dot 4 recommended. (Don't be
tempted to use Dot 5 - it's a silicon based fluid which is more trouble than
it's worth for road cars).

Don't forget to check the condition of the brake master cylinder either -
several test day racers have learned the hard way re this particular item at
Pukekohe Raceway at the hairpin over the years - it's a major cause of
spongy and failed brakes.

During Pukekohe Test Day Introductory Sessions (now compulsory), it's
advised that you pump the brakes once or twice down the back straight to
test if the brakes still feel strong (or are even working!!) after a few
laps. If you feel a spongy pedal during racing, it's strongly advised you
slow down ASAP and pull off into the pits at the earliest opportunity.

Cheers
Mark
Firm Believer in 98 Go Juice - Go for it!

MadMaz
Need, more, 5-ing, time....
Need, more, 5-ing, time....
Posts: 100
Joined: Thu May 18, 2006 10:56 pm
Location: Pukekohe

Brakes

Post by MadMaz » Tue May 16, 2006 11:17 pm

Good call Terry

The condition of the brakes are paramount out on the track - and that means
the age and type of brake fluid and the condition of the brake pots, seals &
presence of vapour - usually caused by old brake fluid absorbing
water and then boiling away under temperature. Brake fluid is highly
hygroscopic & should be replaced annually - Dot 4 recommended. (Don't be
tempted to use Dot 5 - it's a silicon based fluid which is more trouble than
it's worth for road cars).

Don't forget to check the condition of the brake master cylinder either -
several test day racers have learned the hard way re this particular item at
Pukekohe Raceway at the hairpin over the years - it's a major cause of
spongy and failed brakes.

During Pukekohe Test Day Introductory Sessions (now compulsory), it's
advised that you pump the brakes once or twice down the back straight to
test if the brakes still feel strong (or are even working!!) after a few
laps. If you feel a spongy pedal during racing, it's strongly advised you
slow down ASAP and pull off into the pits at the earliest opportunity.

Cheers
Mark
Firm Believer in 98 Go Juice - Go for it!

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