thunderace
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| posted on 6/3/09 at 10:06 PM |
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the mot are we now allowed hydraulic handbrakes
the mot says the hand brake must me merchanical so was shocked to see its a button???on the new vw Passat so are we now allowed hydraulic handbrakes.
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blakep82
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| posted on 6/3/09 at 10:07 PM |
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nope.
passat is electro-mechanical
________________________
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don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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rusty nuts
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| posted on 6/3/09 at 10:12 PM |
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Some Mercedes, Renaults and Range Rovers use electro mechanical handbrakes. Going to be fun changing brake pads
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goaty
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| posted on 6/3/09 at 10:12 PM |
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yes, but needs to be able to lock in position i thought....
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Gazeddy
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| posted on 6/3/09 at 10:34 PM |
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afaik you could have always had a hydro handbrake it just has to be completely separate from the main brakes ie second caliper
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jollygreengiant
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| posted on 7/3/09 at 06:36 AM |
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quote:
Originally posted by rusty nuts
Some Mercedes, Renaults and Range Rovers use electro mechanical handbrakes. Going to be fun changing brake pads
Some of them have an automatic function as well, - when the engine is off (even key in but engine not running & no motion sensed from wheels)) the
handbrake is activated automatically. These do have a service mode that I believe allows about an hour of wheel free before it re-activates the
parking brake. I have not worked on these but as you say they are I believe interesting to work on.
Beware of the Goldfish in the tulip mines. The ONLY defence against them is smoking peanut butter sandwiches.
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speedyxjs
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| posted on 7/3/09 at 08:10 AM |
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I believe jaguar use a hydraulic handbrake but there must be something mechanical about it or they wouldnt be road legal.
How long can i resist the temptation to drop a V8 in?
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Gazeddy
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| posted on 7/3/09 at 08:47 AM |
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when you get them in service mode you just push the piston back or wind it back like you would normally
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adithorp
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| posted on 7/3/09 at 08:55 AM |
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Hydralic handbrakes are not allowed. On hydro/mechanical calipers the handbrake is mechanical using a cam or screw to apply force to the pads and not
hydralic pressure.
Electro/mechanical handbrakes fall into two categories.
First is older type, like Jag/Ford/older Merc's, where the normal handbrake cable system is pulled by (basically) an electric moter turning a
screw to pull the cable. Electronics control the operation of this motor and can include automatic setting. Without the motor turning the cable
can't release.
The second and new system, fitted to the latest VW,Audi,Mercs, Uses a moter inside the caliper itself and winds the piston out with the aid of a swish
plate (look it up) to create presure. Again this is mechanical presure. This has very sophisticated electronics controling it. With automatic setting,
anti roll-back, padwear warning, etc. Special diagnostic kit is required to reset the pistons and change the pads and the manufacturers are not using
a common system so VW kit won't reset Merc and they're not cheap! You won't be changing your own rear pads!
adrian
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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prawnabie
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| posted on 7/3/09 at 09:35 AM |
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Newer renaults have a motor inside a box that has two handbrake cables coming out of it to the calipers.
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adithorp
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| posted on 7/3/09 at 09:56 AM |
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quote:
Originally posted by Gazeddy
when you get them in service mode you just push the piston back or wind it back like you would normally
For the first system I decribed then yes.
For the second definatly NO, unless you want a big bill.
adrian
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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40inches
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| posted on 7/3/09 at 10:07 AM |
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Gendan now sell a service module just to allow a change of pads http://www.gendan.co.uk/product_VS8621.html
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britishtrident
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| posted on 7/3/09 at 10:44 AM |
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On the VW the mechanism works by a stepper motor driving a worm which turns a cog which applies the brake ---- a worm drive
"ovehauls" ie worm can drive the cog but the cog can't drive the worm.
Needles complexity the real reason is probably connected with so calleds green cars that turn the engine off when stopped at the traffic lights.
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