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Hi
Kevin
When
Jason and I first took Lex out for a test run (at least 4 years sitting still
remember), the brakes were awful. When we got back we discovered only one of the
four front pots was actually engaging, and that was without enthusiasm!
I
pulled the wheels off, took out the pads and pumped like crazy on the pedal.
Eventually all 4 pots creaked out. I squirted them with a bit of oil and
squidged them back in using Jason's Magic Brake Retraction Tool (a guy who has
an enormous Snap-On tool chest still uses this metal pipe with a flat bar welded
to it for brakes), then repeated the process. I think I had to take the calipers
off to get the pots back in, but after doing this twice, they were fine, and
have been ever since.
If the
pot is well and truly stuck, you can use James' idea of making a bicycle pump
attachment for the bleed screw. You can then pump air into the pot to forceit
out.
Or say
bollx to it and go down the local motor factors and buy a new pair of calipers
for under £50.
I also
had a problem with one of the rear calipers - Jason made an educated guess that
it was the flexi-hose and was spot-on. The Diesel Centre can get flexi hoses
that will fit (though they aren't a 100% match - 1/2" longer on the back and 1"
shorter on the front) for about £9 each.
There's a stainless braided clutch line too BTW,but
only really makes a difference in the hot weather.
You
could be right on the vacuum line - easy enough to check.
M
Hi
Martin
I
collected the car about 2 weeks ago and drove it about 150 miles. I noticed
that brakes need a huge amount of effort, as does the
clutch.
The
front wheels came off last night and after the drive I would have expected the
discs to be shiny.They are however quite tarnished
and slightly pitted. Hence my thoughts on the 4 pot caliper and
grooved disks.
You
said that "my brakes are good enough", Iam
suspecting a collapsed vacuum to the brake servo, seized or rusty calipers and
or grotty disks.
What do you
think?
Kevin #5959
-----Original
Message-----
From: Gutkowski, Martin
[mailto:martin.gutkowski@xxxx]
Sent: 06 February 2003 2:17
AM
To: doc-uk@xxxxxxxxxxxxxxx
Subject: RE: [doc] ABS
Brakes
Chris H and I had a chat about this with Steve
Wynne some time ago (Eurofest actually) on ths subject and I completely
understand what he said. The problem with upgrading the front brakes onthe
DeLorean is the weight distribution. Look at any modern cars - my Xantia has
fantastic brakes which are 300mm double walled vented on the front and
piddly 200mm plates on the back with postage stamp pads. It stops as if
stuck to the road. The active pitch correction and power assisted high
pressure hydraulics helps....
The DeLorean has roughly the same sized discs front
and rear and there's reason for that - the weight distribution gives
it a gloriously even braking force. If you uprate the fronts, the front
wheels'll skid before the backs. At the end of the day, I'm quite capable of
pulling a 4-wheel skid on a dry road - my brakes are good enough (not that
I've tried mind you!!!). And I haven't invested in a set of Marty Maier's
Stainless braided brake hoses, or kevlar pads as yet (these will both
increase the "sharpness" of the pedal).
Bottom line: If one were to quote the
"rubber-on-the-road-to-weight ratio", I think the DeLorean would do quite
well. It stops remarkably well as it is and I would think about kevlar pads
and upgraded flexi-hoses with a set of Pirelli tyres before worrying about 4
pot calipers (and how would you work the handbrake if changing the rear
calipers?). Also, there's not a lot of room in those 14" front wheels
:-)
Martin
Hi Stian
Good question!.
I am also a little concerened about the brakes. I think however ABS
is a non starter sensors need to be put on the wheels etc,etc,.
I am looking into changing the front calipers to 4 pot together
with grooved disks. this should increase the effiency of the
brakes. Have any others in the DOC done this ??
Kevin #5959
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