rear brake pressure regulating value adjustment
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  1. #1
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    Default rear brake pressure regulating value adjustment

    Hi, haynes manual says that the rear brake pressure regulating value adjustment must be performed by a 'qualified Peugeot mechanic' for a 405 with disk brakes.

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    Any comments from people in the know to how to check this in the home garage/workshop?

    Geoff

  2. #2
    1000+ Posts PeterT's Avatar
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    Yes, park on a hill, facing downwards. On rear wheels on car ramps. Very special techniques indeed!

    '92 205 Mi16
    '90 Mi16x4

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    It is supposed to register certain standing pressures for rated loads over the rear axle. You'll need to cook up a gauge with bleeder, to read off one rear caliper feed pipe.

    The effect in a nutshell, is bugger-all rear braking under light loads, and full flow at maximum load. Driving with it hardwired for full flow, produces some interesting effects if you have to attempt a crash stop.

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    1000+ Posts pgti6's Avatar
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    Is it that you're trying to bleed the rear brakes & having problems that you think the proportioning valve is faulty? If so, you need to jack up the right hand trailing arm to activate the valve, then bleeding can go ahead.
    Track car-Steel Grey 405 Mi16 2.2 litre


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  5. #5
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    Fitted valves to both mi s never adjusted one always bleed them with all wheels on ground the rears can take a bit of bleeding time but My rear pads on both mi wear down slowly so are working

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    Do not think it has a problem - just changing all hubs, rotors, lines, rear struts, etc and wondered if it needs adjustment or just leave as-is.

    Do they have a habit of failing? How would you test?

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    You could test for full pressure at maximum simulated load (say 580kg occupants, 120kg luggage) by comparing to front line pressures. Then check pressure drops away sharply at the rear when just one 80k dummy weight in the car's front seats.

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    1000+ Posts jo proffi's Avatar
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    Quote Originally Posted by mi16pug View Post
    How would you test?
    If I had lots of time and a brake pressure gauge, a manual with the thresholds vs ride height and a 4 post hoist.....I'd do it by the book (at least thats the renault book way), but as I dont have any of those things I'd simply get my tyre pressures sorted, do an emergency stop at 30km/h on white concrete and get out and look at the skid marks. Dont go too fast or the front skid marks and rear skid marks join up and confuse the issue.

    That is how I check mine and diagnose a faulty valve.

    Jo

  9. #9
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    Sounds good to me - i'll give this a go when back on the road and out of the workshop. Thanks.
    GT

    Quote Originally Posted by jo proffi View Post
    If I had lots of time and a brake pressure gauge, a manual with the thresholds vs ride height and a 4 post hoist.....I'd do it by the book (at least thats the renault book way), but as I dont have any of those things I'd simply get my tyre pressures sorted, do an emergency stop at 30km/h on white concrete and get out and look at the skid marks. Dont go too fast or the front skid marks and rear skid marks join up and confuse the issue.

    That is how I check mine and diagnose a faulty valve.

    Jo

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