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About DepthHoar

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    E39 530d (manual) & E39 M5 (2001MY)

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  1. DepthHoar

    Rusted brake caliper

    Re. Alloy calipers and salt. My 530d has spent most of its life plying its trade on Britain's most heavily salted roads up here in the Scottish Highlands. There was some pitting on the end of the piston (almost certainly salt related) where it's exposed and in contact with the brake pad but they were more or less unmarked everywhere else. Apart from the exposed contact area just mentioned, the rest of the piston behind the dust seal looked unmarked and as smooth as a baby's bum. Properly fitted and undamaged dust seals do a lot to protect the piston from corrosion due to the ingress of road crud and salt. Replacement of those dust seals really ought to be part of a maintenance schedule on most vehicles. I bet most only get replaced when they're shredded due to age and have already let a whole load of salt/crap creep past them and ruin the piston. I'd actually bought new steel pistons from Bigg Red when preparing for the refurb but decided to reuse the old ones. Didn't realise the calipers were alloy until I actually took them apart. Had assumed they would be iron with steel pistons so, when planning the refurb, I bought new standard replacement steel pistons. Looking back, not an entirely good idea putting steel pistons inside an alloy caliper due to the potential for galvanic corrosion, though in reality that may be a minor issue in the grand scheme of things. Brakes International are up to speed with the different caliper types for the E39 530d (Bigg Red, take note!) and list factory re-manufactured calipers for the 530d in both alloy and cast iron (depending on model/age) as well as selling alloy pistons. Interestingly, the alloy calipers are a fractionally cheaper than the cast iron ones.
  2. DepthHoar

    Rusted brake caliper

    Alloy calipers were bog standard OE fitment on my particular 530d (MY 2000, pre-facelift).
  3. DepthHoar

    Rusted brake caliper

    It's normally the piston that corrodes and creates a rough surface for the square cut seal to get hung up on and so not allow the piston to retract. Looking at your first photo, it looks like there's a slight ring of cruddy rust around the piston. The bore of the caliper and the groove for square cut seal inside the caliper looks OK, though I'm only going on the scant evidence of your photo. Try to get hold of a stainless steel piston (if you can - see below) since this will be more of a long term solution to corroding pistons in an iron caliper. The corrosion on the piston doesn't have to be much for the square cut seal to get hung up. The piston surface needs to be absolutely smooth to allow the square cut seal to do its work properly and retract when you release the brake pedal. The square cut seal sort of rotates slightly against the piston when the brakes pedal is pushed and then resumes its position and shape - and ever so slightly pulls the piston back - when brake pedal is released. Rust can get established quickly on the piston if the dust seal isn't a good fit. Try to get hold of original ATE dust seals since these seem to fit better, more snugly and appear to be made of a better grade of rubber. My 530d has alloy calipers and pistons. I'm on 175k miles and still on the original pistons. Never had them seize. The seals have been changed once. Different story on my M5 with iron calipers and steel pistons. Have yet to find a source for stainless pistons for my M5....though I could get them made at massive expense!
  4. DepthHoar

    E39 front door seal - body side

    Hi Guys, Can you price a body side door seal for a front door on an E39, please. Part no. 51 72 7 116 403 With thanks. Tom
  5. DepthHoar

    e39 M5 Oil Choices.

    Shell Helix Ultra Racing 10W60 user here. Just paid £117 plus change for a 20 litre barrel (£5.85 per litre). Bought here: https://www.123engineoil.co.uk/Engine-oil/SHELL/Helix-Ultra-10W-60-Racing/p-OIL-465
  6. DepthHoar

    E39 saloon: Rear seat belt retractor. OSR or NSR. Black.

    Cheers for that but decided to get a new one.
  7. Hi Guys, Looking for a rear seat belt retractor in Schwartz (black) for a Saloon. Nearside or offside rear, not the centre one. Part number is 72118198478 Definitely needs to be working properly (not just occasionally). Must extend and retract smoothly & reliably and lock when pulled quickly. (I know this sounds a bit like I'm trying to tell you how to suck eggs...but I bought an eBay used one that "works perfectly" but does nothing of the sort.) So, please, a nice working one!
  8. DepthHoar

    Seat belt

    Hi Guys, Looking for a price for a rear (offside) seat belt retractor in Black. VIN: BJ11997 Part number is 72118198478. Look forward to your reply. Tom
  9. DepthHoar

    M5 purchase potentially

    Will be watching that Munich Legends eBay car with interest. I nearly (so nearly!) bought an immaculate, well historied 60k miles Silverstone blue one from them in 2014 for £14,000. How times (and values) have changed.
  10. DepthHoar

    M5 purchase potentially

    Some big mileages recorded over on M5board: https://www.m5board.com/vbulletin/e39-m5-e52-z8-discussion/190847-who-has-most-miles-20.html#post6233777 (One at 310,000+ miles and the link dates from 2015)
  11. DepthHoar

    Radio Cassette Intermittent Functioning

    Good reply! I definitely get stick for owning TWO E39s! Maybe I should grow a beard?
  12. DepthHoar

    Radio Cassette Intermittent Functioning

    Cassettes! I'm told they're becoming a 'thing', same as happened to vinyl. (Not a hipster by any chance..?)
  13. DepthHoar

    540i M62 / B10 V8 facelift coolant change

    Plain/distilled water only will be OK for short time.
  14. DepthHoar

    540i M62 / B10 V8 facelift coolant change

    50% concentrate, 50% water.