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Have you checked for codes? Post all codes here.  What concerns me are things like the brake switch being out of adjustment or defective and a code set for that or a low voltage or network problem.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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no errors reported, check sensors from brakes and cruise control.

the car was at the pseudomechanics, and I bring it to order. I have peace with you thanks to the cooling system. I have already replaced the front wheel bearing. was cruise control and I have to see the rear shock absorbers because it is terribly hard and I see that it has ordinary shock absorbers installed and I see installations with a sensor.

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5 hours ago, ChrisNederland said:

no errors reported, check sensors from brakes and cruise control.

the car was at the pseudomechanics, and I bring it to order. I have peace with you thanks to the cooling system. I have already replaced the front wheel bearing. was cruise control and I have to see the rear shock absorbers because it is terribly hard and I see that it has ordinary shock absorbers installed and I see installations with a sensor.

Does it have air shocks in the rear?, 

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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When you say standard, do you mean, NOT an air shock?

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Can you be a little more specific on the cruise issue?

Does it engage?

MY 97 Seville had a no resume issue. It was caused by a plug under the hood. It joined the dash plug to the underhood components. The plug has 2 rows, about 12 wires per side. 

ONe of the wires had corroded at the pin and lost connection. 

Now I realize your 98 is very different from my 97 but it may use the same concept. IT was right by the strut tower in the electrical center

GM FAN FOREVER

Nice, clean, luxury= fine automobile

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11 hours ago, BodybyFisher said:

When you say standard, do you mean, NOT an air shock?

now I am wearing normal shock absorbers without air connection.

and the car has installations at the back together with the compressor.

the same as someone put on pads without sensors and the message "check brake pads" pops up

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I have a set of air shocks that may fit your car. I have had them for a couple of years, I bought them and for some reason they didnt fit my friends Seville.  Here is the part # and Cadillacs it fits.  Please confirm that this AC DELCO part will fit your car and if it does we can work out a price and how I can ship them to you, if you would like them.   They were $125, you can have them for $50US plus shipping.  They come with new air tubing and fittings.

You are hitting hard because the air shocks raise the rear of the car to proper ride height.  The suspension is probably bottoming out.

However, please determine that your ride height compressor is working.   When you turn the key on, first you will hear the fuel pump cycle for about 3 seconds and then the compressor will cycle and turn off.  It is possible that it was disconnected when the standard shocks were installed.  Check that the fuse is in place and connector connected if you don't hear it cycle.  Also look around the left rear (I think) for a level sensor and be sure its arm is attached to the suspension.

Report any codes related to the leveling system here.

I have them in storage, if you are interested, Ill get them out and take photos. 

20200325_205525.jpg

20200527_063009.jpg

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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