Car Rolls Slightly Before Handbrake/Emergency Brake Catches - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

pushrod · 01-01-2016, 04:11 PM

My car definitely does this, and has since new. It rolls a good inch or two, and I mean actually _rolls_. It is not related to suspension.

I've always just chalked it up to the design of the parking brake. It's also extremely grabby compared to other vehicles I've driven.

humfrz · 01-01-2016, 04:29 PM

Quote:

Originally Posted by Jord104

Hi all,

Sorry to hijack the thread somewhat but I have a similar issue. I know that the wheel is moving when the handbrake is applied. This is only happening on the right hand side and there is no movement in the left hand side wheel.

This is demonstrated here:

Has anyone encountered this or do you have any ideas of a cause? I have yet to take the hub assembly apart for a closer look.

Jordan

Since your wheel is off the ground, that looks to be because of a bit of "play" in the differential ......

Which is OK.

humfrz

Sony · 01-06-2016, 03:41 PM

This issue is normal operation, it has to do with the design of the parking brake on most Subaru's. The Parking/E-Brake on most Subaru's are a "Drum In Disc" type design where there is a smaller drum brake inside the hub of your rear Disc brakes.

If you have ever worked on "Self-Adjusting Drum Brakes" then you know that the entire Mechanism inside the brakes floats around a bit as a function of the self adjustment part of the brakes. This is what causes the movement when you let off the floor pedal, because you are switching from the disc brake portion of the brakes to the drum brake portion and the drum brake portion of the brakes floats a little bit inside the drum as part of the self-adjustment function of the drum brakes.

Here is a useful animation on how drum brake adjusters work.

http://auto.howstuffworks.com/auto-p...rum-brake2.htm

Jord104 · 01-14-2016, 07:25 AM

Thanks for the replies very helpful, I had to replace a few bits on that side and never noticed the movement until after I had done so.

I also had a squeak at the time of posting when driving which I thought was related to this but I have since got rid of that and can see it is normal and handbrake functions just fine.

Jordan

01-06-2016, 03:41 PM	#17
Sony Senior Member Join Date: Jul 2011 Drives: 2013 Subaru BRZ MT Limited Location: Somerville, MA Posts: 805 Thanks: 20 Thanked 463 Times in 200 Posts Mentioned: 25 Post(s) Tagged: 0 Thread(s)	This issue is normal operation, it has to do with the design of the parking brake on most Subaru's. The Parking/E-Brake on most Subaru's are a "Drum In Disc" type design where there is a smaller drum brake inside the hub of your rear Disc brakes. If you have ever worked on "Self-Adjusting Drum Brakes" then you know that the entire Mechanism inside the brakes floats around a bit as a function of the self adjustment part of the brakes. This is what causes the movement when you let off the floor pedal, because you are switching from the disc brake portion of the brakes to the drum brake portion and the drum brake portion of the brakes floats a little bit inside the drum as part of the self-adjustment function of the drum brakes. Here is a useful animation on how drum brake adjusters work. http://auto.howstuffworks.com/auto-p...rum-brake2.htm __________________ Dark Blue 2020 Subaru Forester Sport, Name: Apollo - God of Music WRB 2013 Subaru BRZ Limited MT, Name: Zeus - Father of all God's and God of Sky and Thunder Perrin Cat-Back, ECUTek Tune by Kaizen Tuning, Perrin Silicone Radiator Hoses, Perrin Master Cylinder Brace, Perrin True Cold Air Intake

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01-01-2016, 04:11 PM	#15
pushrod Benched 86lb Join Date: Jul 2014 Drives: Ultramarine FR-S Location: Ottawa Posts: 806 Thanks: 899 Thanked 928 Times in 393 Posts Mentioned: 16 Post(s) Tagged: 0 Thread(s)	My car definitely does this, and has since new. It rolls a good inch or two, and I mean actually _rolls_. It is not related to suspension. I've always just chalked it up to the design of the parking brake. It's also extremely grabby compared to other vehicles I've driven.

01-14-2016, 07:25 AM	#18
Jord104 Junior Member Join Date: Aug 2015 Drives: '15 Subaru BRZ Location: West Midlands Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Thanks for the replies very helpful, I had to replace a few bits on that side and never noticed the movement until after I had done so. I also had a squeak at the time of posting when driving which I thought was related to this but I have since got rid of that and can see it is normal and handbrake functions just fine. Jordan

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