Bedding-Down Parking Brake - Toyota Sienna Forum - siennachat.com
 
LinkBack Thread Tools
post #1 of 7 (permalink) Old 12-10-2016, 10:56 PM Thread Starter
Junior Member
 
bradly1101's Avatar
 
Join Date: Dec 2016
Location: Long Beach, California
Posts: 29
Garage
Bedding-Down Parking Brake

On p. 195 of the '17 manual it says this:

Quote:
Drum-in-disc type parking brake system
Your vehicle has a drum-in-disc type parking brake system. This type of brake
system needs bedding-down of the brake shoes periodically or whenever the
parking brake shoes and/or drum are replaced. Have your Toyota dealer perform the bedding down operation.
I didn't know what bedding-down meant. After Googling it it sounds like heating up and cooling down of the shoes/drums repeatedly. I can't imagine a parking brake wearing out periodically, so does that mean you must take it in periodically to have this done? And what's the period? I don't see it mentioned in the maintenance schedule.

Is this done prior to delivery?
bradly1101 is offline  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 12-11-2016, 12:30 AM
Supporting Member

 
Join Date: Mar 2011
Location: Mid Hudson Valley, NY (USA)
Posts: 2,606
Re: Bedding-Down Parking Brake

How do I say this, and keep this page "G" rated?

In this case, "bedding down" or "bed-in" of brake shoe material and the iron drum is more akin to the exchange of bodily materials, and the driving out of inhibitions......

So.... Brakes don't work well when the mating surfaces are completely dissimilar. Brakes work best when a bit of pad material makes it's way into the porous surface of the iron, and a tiny bit of iron makes it into the pad. When they become one by the exchange of materials, they bind together for maximum friction. The second aspect is that the heat drives out some of the adhesive resins that hold the pad fibers together, increasing the effective surface area.

As you use your parking brake in a stationary mode 100% of the time, you rarely do the above two actions. If you drive relatively slowly and lightly push on the parking brake, perhaps you could get them to slow the car without locking up the rears. Repeat it a few times in a safe place in case you overpush and lock up the rears. That would probably do the job.

Current: '15 Sienna Limited Premium (FWD), '14 Subaru Outback, '13 Honda CRV AWD.

Past: '08 Sienna LE (FWD), '02 Subaru Outback, '02 Honda Odyssey EX
fibber2 is offline  
post #3 of 7 (permalink) Old 12-11-2016, 12:58 AM Thread Starter
Junior Member
 
bradly1101's Avatar
 
Join Date: Dec 2016
Location: Long Beach, California
Posts: 29
Garage
Re: Bedding-Down Parking Brake

Quote:
Originally Posted by fibber2 View Post
How do I say this, and keep this page "G" rated?

In this case, "bedding down" or "bed-in" of brake shoe material and the iron drum is more akin to the exchange of bodily materials, and the driving out of inhibitions......

So.... Brakes don't work well when the mating surfaces are completely dissimilar. Brakes work best when a bit of pad material makes it's way into the porous surface of the iron, and a tiny bit of iron makes it into the pad. When they become one by the exchange of materials, they bind together for maximum friction. The second aspect is that the heat drives out some of the adhesive resins that hold the pad fibers together, increasing the effective surface area.

As you use your parking brake in a stationary mode 100% of the time, you rarely do the above two actions. If you drive relatively slowly and lightly push on the parking brake, perhaps you could get them to slow the car without locking up the rears. Repeat it a few times in a safe place in case you overpush and lock up the rears. That would probably do the job.
LOL. Thanks for that. It would be nice if it had the old style parking brake that could be released without fully engaging it.

Do you guys (and gals) do this to your Siennas? I know I can ask the dealer, but is this common for them to do prior to delivery? Or do they expect you to have it done right away? What happens to a non-bedded parking brake? It won't hold the van?
bradly1101 is offline  
post #4 of 7 (permalink) Old 12-11-2016, 01:12 AM Thread Starter
Junior Member
 
bradly1101's Avatar
 
Join Date: Dec 2016
Location: Long Beach, California
Posts: 29
Garage
Re: Bedding-Down Parking Brake

I did some more searching and found this:

http://bd8ba3c866c8cbc330ab-7b26c6f3...ake_Bed_In.pdf

It speaks of releasing the brake before the car stops during the procedure. I don't think that that is possible with the Sienna's parking brake.
bradly1101 is offline  
post #5 of 7 (permalink) Old 12-11-2016, 09:55 AM
Supporting Member

 
Join Date: Mar 2011
Location: Mid Hudson Valley, NY (USA)
Posts: 2,606
Re: Bedding-Down Parking Brake

It's certainly much harder with a push-on push-off system, or like in my Subaru, an electronically motor controlled system. I miss the old hand operated systems.

I never have done it, nor have I asked. I have to give this some thought.

Current: '15 Sienna Limited Premium (FWD), '14 Subaru Outback, '13 Honda CRV AWD.

Past: '08 Sienna LE (FWD), '02 Subaru Outback, '02 Honda Odyssey EX
fibber2 is offline  
post #6 of 7 (permalink) Old 12-11-2016, 10:31 AM
Senior Member
 
Join Date: Apr 2014
Posts: 427
Re: Bedding-Down Parking Brake

If the parking brake holds on a hill, bedded in or not, I wouldn't give it too much thought, as it is working.
Also, the more it is used, the better it works.
lipster is offline  
post #7 of 7 (permalink) Old 12-11-2016, 02:27 PM Thread Starter
Junior Member
 
bradly1101's Avatar
 
Join Date: Dec 2016
Location: Long Beach, California
Posts: 29
Garage
Re: Bedding-Down Parking Brake

In the official procedure from ECS, the starts and stops add up to over five miles. In the city I'm in there would be no safe place to do this unless going back and forth in a parking lot a bunch of times. People would think I'm crazy, and would probably lock the brakes up with this parking brake design. I've heard so many dealer nightmare stories that I don't think I'd trust them with this.
bradly1101 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Toyota Sienna Forum - siennachat.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome