RE: [doc] ABS Brakes
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RE: [doc] ABS Brakes



Hi Martin
 
For £50 the pair it is not worth the aggro of messing about with them, what is the make of the Caliper, from what car and year.
 
Thanks Kevin  
-----Original Message-----
From: Gutkowski, Martin [mailto:martin.gutkowski@xxxx]
Sent: 06 February 2003 2:47 AM
To: doc-uk@xxxxxxxxxxxxxxx
Subject: RE: [doc] ABS Brakes

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 oneof 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 force it 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
-----Original Message-----
From: Kevins Work [mailto:kevin.milliken@xxxx]
Sent: 06 February 2003 18:33
To: doc-uk@xxxxxxxxxxxxxxx
Subject: RE: [doc]ABS Brakes

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", I am 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 20032:17 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 on the DeLorean is the weight distribution. Look at any moderncars - my Xantia has fantastic brakes which are 300mm double walled ventedon 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 aset 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
-----Original Message-----
From: Kevins Work [mailto:kevin.milliken@xxxx]
Sent: 06 February 2003 18:03
To: doc-uk@xxxxxxxxxxxxxxx
Subject: RE: [doc] ABS Brakes

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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