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Thread: 451 Brakes

  1. #11
    Join Date
    Jun 2015
    Location
    Jersey
    Posts
    885

    Default Re: 451 Brakes

    The £ 177 was for a general service, the brakes were fine and didn’t need attention. My brother was worried about a £ 600 to £ 700 bill so was pleased when it only needed a service.
    2019 Smart Fortwo Prime Premium Cabrio A453 Turbo 900cc 90hp
    R-Link Evolution Sat Nav/DAB with Android Auto, Bluetooth, USB, SD, AUX
    Heated Seats, Electric Mirrors, Air Con
    6-Speed Dual Clutch Automatic
    Rear Parking Sensors
    White with 15” Alloys

  2. #12

    Default Re: 451 Brakes

    I have the same problem with my new (to me) 2008 Smart 451, the brakes are spongy and the pedal goes half way to the floor, but the actual stopping power is ok. The pedal firms up after a couple of pumps but goes straight back to being soft.



    I swapped the pads for new ones but it didn't make any difference, and the discs are fine, so the next step is to bleed the brakes I guess. Looking at the service history it hasn't had a brake fluid change for a while but the reservoir is full.



    After that I'll try braided brake hoses, as rubber hoses can stretch as they get old reducing hydraulic pressure. My Lotus Elise had that exact problem with its rubber clutch hose; fitting a braided hose made the world of difference.

  3. #13
    Join Date
    Sep 2016
    Location
    Burnley
    Posts
    674

    Default Re: 451 Brakes

    Quote Originally Posted by ash73 View Post
    I have the same problem with my new (to me) 2008 Smart 451, the brakes are spongy and the pedal goes half way to the floor, but the actual stopping power is ok. The pedal firms up after a couple of pumps but goes straight back to being soft.



    I swapped the pads for new ones but it didn't make any difference, and the discs are fine, so the next step is to bleed the brakes I guess. Looking at the service history it hasn't had a brake fluid change for a while but the reservoir is full.



    After that I'll try braided brake hoses, as rubber hoses can stretch as they get old reducing hydraulic pressure. My Lotus Elise had that exact problem with its rubber clutch hose; fitting a braided hose made the world of difference.
    It is probably your rear brakes. You can tell if you try it with the handbrake on and with it off and note the difference in pedal height.

  4. #14
    Join Date
    Oct 2017
    Location
    Bury Lancs
    Posts
    216

    Default Re: 451 Brakes

    I'd agree with Mjo .... self adjust brake shoes often don't.

  5. #15

    Default Re: 451 Brakes

    Interesting thanks, there's a slight difference in pedal feel with the handbrake on but it's still mushy. I haven't adjusted drum brakes before; I'll bleed the brakes first (I bought a one way valve to do that) and then probably admit defeat and take it to the local garage!

  6. #16
    Join Date
    Jun 2015
    Location
    Jersey
    Posts
    885

    Default Re: 451 Brakes

    Our brakes were checked over during the service and there was nothing wrong with them. We put it down to the user not being used to the car.

    The car had new brake fluid and were bled at a service the year before.
    2019 Smart Fortwo Prime Premium Cabrio A453 Turbo 900cc 90hp
    R-Link Evolution Sat Nav/DAB with Android Auto, Bluetooth, USB, SD, AUX
    Heated Seats, Electric Mirrors, Air Con
    6-Speed Dual Clutch Automatic
    Rear Parking Sensors
    White with 15” Alloys

  7. #17
    Join Date
    Oct 2017
    Location
    Bury Lancs
    Posts
    216

    Default Re: 451 Brakes

    Quote Originally Posted by ash73 View Post
    Interesting thanks, there's a slight difference in pedal feel with the handbrake on but it's still mushy. I haven't adjusted drum brakes before; I'll bleed the brakes first (I bought a one way valve to do that) and then probably admit defeat and take it to the local garage!
    If you adjust the shoes too much you'll not get the drum back on 😉 Drums brakes are quite straight forward 😊

  8. #18
    Join Date
    Jul 2005
    Location
    over here
    Posts
    13,887

    Default Re: 451 Brakes

    Sometimes worth replacing the drums too , you’ll have to gauge wear
    fq101.co.uk

  9. #19

    Default Re: 451 Brakes

    Quote Originally Posted by EmilysDad View Post
    If you adjust the shoes too much you'll not get the drum back on 😉 Drums brakes are quite straight forward 😊
    You dont need to remove the drums in order to adjust the rear brakes.
    Here is the very simple procedure:
    Step on the foot brake and hold, then while holding: Pull and release the handbrake numerous times.
    Every time you pull it, the auto adjusters will advance, tightening up the play between the shoes and the drum.
    If you follow this prcedure from time to time, you will good brakes. Works on all smarts.
    Incidently, this is the way the smart mechanics do it, it is in their WIS procedures.
    Bjorn

  10. #20
    Join Date
    Oct 2017
    Location
    Bury Lancs
    Posts
    216

    Default Re: 451 Brakes

    I know. I assumed that a proper check on the brakes was going to be carried out .....

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