ARRMA Durango Ltd Cookie Policy
At Team Durango, we're serious about racing! We're also serious about giving you the best user experience possible when using our website, and to do this we need to use 'cookies'. By continuing to use our website you are implying your consent for us to use cookies. You can read all about what we use cookies for here.

March 3, 2011

DNX408 Brake Shimming

Filed under: News,Tricks and Tips — Tags: — Stuart @ 6:12 pm
Brake Animation

Brake setup on the DNX408 is critical and the best way to achieve this is to take time and shim things properly.   Early DNX408’s didn’t come with shims included, and with no shimming, the pistons need to move too far for proper braking.

Left:  The correct setting should see minimal movement of the brake actuator arm

The ideal setting is to have between 0.5mm and 1mm of clearance between the brake discs and pads in total – so the piston will move the inner plate 0.5-1mm against the brake disc to clamp it against the opposing plate.

dnx408-brakeshim-11xIt’s best to leave out threadlock until the correct shim setting has been decided as you may find it necessary to assemble / reassemble several times to find a setting that works for you. The screws which the brake pads sit upon have a shoulder that stops them being inserted enough for proper brake clearance.
You’ll need some shims with a 3mm internal diameter to fit over the brake screws. Remember the setting you’re looking for is around 0.5mm to 1mm – less than 0.5 and the brakes might bind up, more than 1mm and you might not get full braking force.

dnx408-brakeshim-01 The screw will only insert as far as the shoulder dnx408-brakeshim-02 With no shims the brake pads are too far apart for proper braking force

Try using a couple of shims to begin with and adjust if needed to suit. Using the shims shown above, I found two to be on the limit, with possibly a little too much movement in the brake pad so I tried again with three which felt a lot better. For fine-tuning you can use thinner shims to get the desired setting.

dnx408-brakeshim-05 Using two shims.
dnx408-brakeshim-07 The shims need to go onto the screw first – on the outside of the brake caliper.

When you’ve found the setting you want – make sure to use threadlock to ensure the screws don’t back out; this will make sure your new setting is maintained.

Once you’ve set the pads, adjusting the brake bias by shortening / lengthening the small link turnbuckle that goes between the front and rear brake arms. Adjusting this link on the car can easily pop it off if the threads are too tight – which will certainly lead to frustration as it’s a difficult place to reach for reattaching the link, with the side guard obscuring the view somewhat.

To make sure the link can be adjusted without popping off, it’s advisable to use some grease when building the joins and then running the turnbuckle fully in and out several times to free things up. Once the joint has been ‘broken in’ correctly it shouldn’t fall-off whilst adjusting.

12 Comments

No comments yet.

RSS feed for comments on this post.

Sorry, the comment form is closed at this time.

Your local Team Durango distributor
T: 217-398-3630
F: 217-398-1104
E: gpinfo@gpmd.com
W: www.gpmd.com
Great Planes Model Distributors
1608 Interstate Drive
Champaign,
IL 61822, USA
USA