I have a 1991 560 SEL, its gas pedal is hard. What can I do to resolve that problem? Also car bounces when driven.

I thought they were all hard? Maybe you should take a look at the pedal itself. Or look at the linkage.

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual

lube linkages with ATF.

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'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E

"lube linkages with ATF". But what kind of ATF?

Whatever kind of ATF you have around the house. If you don't have any, buy the kind your transmission uses.
Alternatively, you could use a little bit of lithium grease - pop the ball and socket link, and dab a little on there.

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It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein


09 Jetta TDI
1985 300D

Yep the FSM says you are supposed to lube the throttle links like once a year, along with the doors and locks. No one does though.

I find a Q tip works great.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

What bounces? Seats? Front end? Rear?

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

I'd guess the rear, since the 560's have that self leveling hydraulic gadget. Might want to check the reservoir.

__________________
It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein


09 Jetta TDI
1985 300D

Mine is the rear as I need accumulators, but his description was vague.

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]