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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars

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Handbrake good back poor forward

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Old Oct 25th, 2020, 20:24   #21
Dirty Rooster
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Thanks Jor, that's an interesting page
Quote:
Originally Posted by jor View Post
Here's a nice insight into parking brakes and their modification:

thosbryant.wordpress.com/2018/10/31/volvo-740-760-parking-brake-repair-brake-shoe-review/comment-page-1

jor
What is seems to show is that different sizes of shoes are available, some smaller than OEM, which could cause a big problem,
and there are solutions.
Takes a bit of understanding but his illustrations are excellent.
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Old Oct 27th, 2020, 00:11   #22
rwdkev
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Originally Posted by mjk164 View Post
If when the handbrake is pulled up hard, the car still rolls a few inches, this is entirely normal. It is the shoes rotating to their stops and it happens on all Volvos with separate handbrake shoes in their rear discs.
You're right, the shoes are designed to float as they only have stops at the rear ends of the shoes. This float enable the shoes to act as a pair together and lock on more evenly and lock on harder as the wheel pushes them round against the stop.

Last edited by rwdkev; Oct 27th, 2020 at 00:15. Reason: Incorrect addressee
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Old Oct 27th, 2020, 00:21   #23
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Originally Posted by kelvinp View Post
I don't quite know who designed the handbrake on the 700s, the ridiculously poor compensator which simply consists of a pin in a bracket on the back axle, both of which wear. Why not have something with proper pins and bushes?
All 700/900's with live axle have this set-up which is disappointingly crude and under-engineered unlike most of the rest of the car.
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Old Oct 27th, 2020, 01:19   #24
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Originally Posted by Dirty Rooster View Post
My 940 handbrake works excellent to prevent the car rolling backwards, really solid, like a rock.
Rolling forward is less good, doesn't seem to bite as hard and is detectable on the MOT rollers.

Could it be something simple?
Should I fit new shoes anyway?
Any reason to fit new drums/discs and see if that works?
This is another trait of the 700/900 park brake (both live axle and IRS) and is normal but only when the shoes are simply worn out.

When the shoes are new, the operating lever that's attached to the end of the cable is in an approximately vertical position. As the linings wear, when the shoes engage with the drum, they and the expander mechanism do so further apart and the lever is pulled in further toward the centre of the vehicle to enable this.

Over a period of time, the lever goes from being vertical to being at an angle and there comes a point when the lever fouls the outboard entrance of the hole in the hub carrier through which the cable passes.

When the shoes are in contact with the drum, both the shoes and the expander mechanism/lever are dragged round together until they contact the stops on the hub carrier.

When the wheels roll FORWARDS, the lever is moved upwards, jammed against the hole entrance and is prevented from moving any further inward so the expander cannot apply any more force to the shoes.

When the wheels roll BACKWARDS, the lever is moved downwards, freed away from the hole entrance and allowed to move further inward and the expander is allowed apply more braking force.
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Old Oct 27th, 2020, 08:16   #25
Laird Scooby
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Quote:
Originally Posted by rwdkev View Post

When the wheels roll FORWARDS, the lever is moved upwards, jammed against the hole entrance and is prevented from moving any further inward so the expander cannot apply any more force to the shoes.

When the wheels roll BACKWARDS, the lever is moved downwards, freed away from the hole entrance and allowed to move further inward and the expander is allowed apply more braking force.
Thanks for that Kev, certainly explains the mysterious action of my handbrake on the left.
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Old Oct 27th, 2020, 20:42   #26
Dirty Rooster
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Yeah that explains it!!
Handbrake is OK now with the new discs, but already ordered new shoes too.
Job's a good 'un.
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