How many times can you pump your brakes before they become stiff? I pump mine around 8-10 times and then they become really stiff...is that normal?

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1979 300sd 290K

With the engine off, at idle, at higher rpm's?

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

Sounds normal to me.

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1984 300SD Turbo Diesel 150,000 miles

OBK member #23

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First check I was checking at a stop light at idle...the guy behind me probably thought I was nuts. It just seems they quickly get progressively harder each time I push them at idle. I wanted to see what was normal as far as holding vacuum at idle.

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1979 300sd 290K

I'm almost 60 so it requires more pumping before mine becomes stiff!

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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.