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Thread: MOT pass but?

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    Default MOT pass but?

    Tinkerbell the newer of the two series 3's I have passed her MOT all I had to do was replace a rear/stop bulb and fit a new exhaust bracket. But the was an advisory "Overall brake efficiency low 57%" I didn't get a chance to speak to the examiner I guess I need to look at all the wheel cylinders and shoes, as the brake peddle has little travel and I fitted a new servo, or go to an MOT station where the examiner has some leg strength!

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    Default Re: MOT pass but?

    Are they properly adjusted?
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    Default Re: MOT pass but?

    go round and pop the drums off to take a look. its not a long or complicated process to check, and if done regularly the drums dont seize on. i take a look every time a have a wheel of for any reason, except at the side of the road of course but that hasnt happened yet. usually any problems are obvious, at the area the problem lies is obvious. if all looks well then chuck everything back on and adjust the brakes up and move on to the next one. i failed the last mot on poor brakes and adjusted them in the car park, went back in and passed, this time i thought it was the same but a quick look showed up the hub seal. the cylinders should be fine unless they are leaking, so there shouldnt be any need to remove components unless something shows up.
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    Default Re: MOT pass but?

    Is this the one you have recently fitted the servo too?
    If so what parts did you end up with ie master and brake 10"single or 11" twin?

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    Default Re: MOT pass but?

    you need to speak to the testere and find out what was low. the front could have been great with the rear doing very little, or vice versa. if one side was low then that results in an inbalance thus a fail, so i presume you have a lack of pressure to probably the rears.

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    Default Re: MOT pass but?

    Quote Originally Posted by lincoln lass View Post
    Are they properly adjusted?
    Well i guess so as there is no pedal travel which would suggest a wheel cylinder not working.

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    Default Re: MOT pass but?

    Quote Originally Posted by Serious Series View Post
    Is this the one you have recently fitted the servo too?
    If so what parts did you end up with ie master and brake 10"single or 11" twin?
    No different land rover and I fitted a 11" duel circuit which was what was fitted originally

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    Default Re: MOT pass but?

    OK an update left rear oil seal leaking shoes contaminated so that corner not working, I have fitted new wheel cylinders and shoes to the front and will finish the rears tomorrow.

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    Default Re: MOT pass but?

    Has it recently had new shoes...they can take a while to bed in...
    Your always better off doing it yourself...1975 88" full tilt 200di.

    Have a look at my other hobby on the youtube link...not all shown on mobile devices.

    https://www.youtube.com/user/nickjaxe/videos

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    Default Re: MOT pass but?

    Quote Originally Posted by nickjaxe View Post
    Has it recently had new shoes...they can take a while to bed in...
    that's what i was thinking. adjustment is important but basically reduces pedal travel. i'd remove the drums. clean out any dust and oil which has accumalated (brake or carb cleaner is good). check the working surface of the drum for corrosion, deep scores or glazing (really shiny finish) a quick sand with 80 grit will remove the glaze. check the shoes for full contact with the drum and glazing. again a light sand will help restore performance. finally check the cylinders are free by pushing them in slighly with a screwdriver. lift the boots and check for corrosion (which may stop the piston extenging further). i put a smear of brake grease on the bore under the boot. after a few miles ( a tank of fuel) check the brake back plates for signs of oil contamination from a leaking hub.

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    Default Re: MOT pass but?

    Quote Originally Posted by nickjaxe View Post
    Has it recently had new shoes...they can take a while to bed in...
    No shoes are well worn (but not evenly) leading shoe well down about 2mm of shoe remains trailing shoe only top 1/2 worn. The drum with the oil leak will not of helped but this landy has always had a "hard" brake peddle I have fitted a new servo and now I can feel the peddle sink slightly if I start the engine with my foot on the brake

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    Default Re: MOT pass but?

    Worth checking the shoes move properly and freely. The bottom pivots can corrode and make the shoes difficult to move.

    Cheap linings sometimes contact unevenly when first installed and take some time to bed in.

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    Default Re: MOT pass but?

    Quote Originally Posted by secondjeremy View Post
    Worth checking the shoes move properly and freely. The bottom pivots can corrode and make the shoes difficult to move.

    Cheap linings sometimes contact unevenly when first installed and take some time to bed in.
    I made a point of checking the bottom pivots as they did appear stiff on the shoes I removed even the one full of oil! I have fitted Mintex shoes all round I found they give the best performance and ware.

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    Default Re: MOT pass but?

    Quote Originally Posted by Uplyme Series 3 View Post
    I made a point of checking the bottom pivots as they did appear stiff on the shoes I removed even the one full of oil! I have fitted Mintex shoes all round I found they give the best performance and ware.
    Also New springs top and bottom and I have deglazed the drums when I stripped the brakes I found a couple of wheel cylinders sticking so new fronts and rears fitted now. I'll give them time to bed in and see how we go(or stop)!

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