 | Home > Technical > how does the hand brake work |
 
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6298   
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I'm interested to understand how the hand brake works. I had assumed it was like a disc brake on a wheel but cable operated.
but I'm thinking not ? where I park up at work its on an incline and this morning I applied the hand brake just before moving the car slightly and then reapplying the hand brake - two very different feels to the lever. so I had a little play - apply hand brake roll back slightly reapply did this several times and then there it was again - a different feel. its as if there's a thicker bit the disc and at that point there's less movement in the hand brake lever. tried this a few times and it was in the same place so I'm sure its not a simple case of caliper sticking. not knowing how the hand brake works the above could be a load of tosh. would be interested in understanding the workings (could be more sleepless nights otherwise  )
thank you. |
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22nd May 2013 5:56am |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324 
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The hand brake is essentially a drumbrake on the back of the transfer box. The fact that it's in the driveline accounts for the 'roll back' as the slack is taken up. The slightly different feel betweeen applications is merely due the inherent play in the way that the shoes seat depedning on how much load is applied each time it's engaged, i.e. whether it's parked on a hill or not.
It's essentially the same design as used on Sereies Land Rovers and is not a precision instrument. Darren 110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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22nd May 2013 6:27am |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6298
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LRA.
thank you very much for that. so its a drum not a disc 
I'm sure its just me worrying unnecessarily but its still seems strange how the bite point might closer in one area of the drum than another on the same incline 
makes me wonder if this and the rumbling (like warped discs) when slowing down is related ? |
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22nd May 2013 6:45am |
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| Cakey Member Since: 19 Feb 2013 Location: Cheshire Posts: 468 
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Mine tends to move after I put the handbrake on. Think I need to carry chocks
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22nd May 2013 7:12am |
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| Go Beyond Member Since: 30 Jan 2012 Location: Headcorn, Kent Posts: 6678
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X-Eng supply a disc handbrake kit if you wanted to go that route
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22nd May 2013 8:48am |
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have had VW van run away down hill du to hand brake recall not being sent to my by VW ('
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| Happyoldgit Member Since: 14 Sep 2007 Location: Norfolk Posts: 3471 
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So now you are worrying about something else
 
The handbrake is totally different from your average car and as LA says it works by a drum brake fixed to the back of the transfer box. There are no cables to the back wheels, the Defender system is quite separate from the footbrake components. You will get a degree of movement after you applied the transmission brake [for that is what it is] and released the foot-brake, it's just the taking up the slack in the various components etc. For some reason Puma transmission brakes were [are] more prone to coming from the factory badly adjusted than earlier models, which is odd considering the design has been pretty similar throughout the model history. You will find many threads on here about people experiencing juddering and odd noises from the brake especially when freewheeling or on over-run. A simple tweak of the adjuster to give the shoes sufficient clearance way from the drum is all that it takes to get it sorted. Steve. Owned numerous Land Rover vehicles of all shapes and sizes over the decades. Current Defender: A non tarts hand-bagged Puma 110 XS USW. [Insert something impressive here such as extensive list of previous Land Rovers or examples of your prestigeous and expensive items, trinkets, houses, bikes, vehicles etc] http://forums.lr4x4.com I used to be Miserable ...but now I'm ecstatic. |
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22nd May 2013 8:59am |
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| farmer giles Member Since: 09 Feb 2011 Location: worcestershire Posts: 1299 
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my very first instruction in land rover driving 20+ years ago was NEVER try a handbrake turn in a LR!
"they don't work like normal cars" |
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22nd May 2013 9:07am |
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| dorstsmith2 Member Since: 06 Aug 2012 Location: On the third rock from the sun in dorset Posts: 188 
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I have seen 110 MOD handbrake turn
 no pic and the drive and passenger balled out as LR taking small arms fire |
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22nd May 2013 9:14am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17386 
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There were issues with the early Puma handbrakes arising from oil migration past the transfer box rear output shaft seal into the drum. This was despite the assembly and seals being identical to the Td5 and was apparently due to the fact the the engine is nose-up on the Puma. There was a recall to deal with this.
I am sure that everyone here knows this, but you should of course never apply a transmission brake of this kind when moving (make sure the MOT tester knows it is a t-brake as well) due to the risk of transmission breakage. Incidentally, why did LR opt for a transmission brake back in 1947? It was so the handbrake would still work effectively (and on all four wheels) even when the (foot) brakes were full of mud/water etc. A sound design decision that has endured to this day. |
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22nd May 2013 10:14am |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20375
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I think IIRC in the manual that it states to also make sure the footbrake is fully applied before putting on the hand brake. In other words you must be at a complete stop before applying with the vehicle "settled" so to speak. So not something you should say drive into your driveway with slam on the footbrake and at the same time the hand brake. That's when you'll get that movement and lurch in the transmission slack. There can be a small amount of slack on a hill be I've always found it extremely minimal and also found the handbrake to be extremely strong with a good hold. Unlike many cars! $W33T $0U7H3RN $UG4R
🇬🇧🏴🏴🏴🇮🇪🇺🇸⛽️🛢️⚙️🧰💪 |
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22nd May 2013 10:41am |
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| MartinK Member Since: 02 Mar 2011 Location: Silverdale (Lancashire/Cumbria Border) Posts: 2665 
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Yes - they look good, and are well-recommended on this forum. Once out-of-warranty, if I get problems, there'll be a X-Eng brake on teh shopping list  Defender "Puma" 2.4 110 County Utility (possibly the last of the 2.4's) |
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22nd May 2013 10:44am |
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| JSG Member Since: 12 Jul 2007 Location: Berkshire Posts: 2412
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Most people leave Defenders in gear as well rather than trusting the handbrake on its own. John
http://www.hampshire4x4response.co.uk 2011 Tdci 110 CSW XS |
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22nd May 2013 1:52pm |
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| farmer giles Member Since: 09 Feb 2011 Location: worcestershire Posts: 1299
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small arms fire directed at me might encourage me to take the risk - assuming i couldn't run into the shooter! |
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22nd May 2013 1:53pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17386
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I believe that (somewhere in the legal small print) that is still a legal requirement - an unattended vehicle must be secured by two independent means - handbrake and in-gear. It is also the reason that autos have a "park" position. |
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22nd May 2013 2:04pm |
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