diff --git a/src/file.ts b/src/file.ts
index 6eed2cabd..d949106a0 100644
--- a/src/file.ts
+++ b/src/file.ts
@@ -29,14 +29,7 @@ import * as crypto from 'crypto';
 import * as fs from 'fs';
 import * as mime from 'mime';
 import * as resumableUpload from './resumable-upload';
-import {
-  Writable,
-  Readable,
-  pipeline,
-  Transform,
-  PassThrough,
-  PipelineSource,
-} from 'stream';
+import {Writable, Readable, pipeline, Transform, PassThrough} from 'stream';
 import * as zlib from 'zlib';
 import * as http from 'http';
 
@@ -100,8 +93,6 @@ export interface PolicyDocument {
   signature: string;
 }
 
-export type SaveData = string | Buffer | PipelineSource<string | Buffer>;
-
 export type GenerateSignedPostPolicyV2Response = [PolicyDocument];
 
 export interface GenerateSignedPostPolicyV2Callback {
@@ -463,7 +454,6 @@ export enum FileExceptionMessages {
   UPLOAD_MISMATCH = `The uploaded data did not match the data from the server.
     As a precaution, the file has been deleted.
     To be sure the content is the same, you should try uploading the file again.`,
-  STREAM_NOT_READABLE = 'Stream must be readable.',
 }
 
 /**
@@ -3567,9 +3557,13 @@ class File extends ServiceObject<File, FileMetadata> {
     this.copy(newFile, copyOptions, callback!);
   }
 
-  save(data: SaveData, options?: SaveOptions): Promise<void>;
-  save(data: SaveData, callback: SaveCallback): void;
-  save(data: SaveData, options: SaveOptions, callback: SaveCallback): void;
+  save(data: string | Buffer, options?: SaveOptions): Promise<void>;
+  save(data: string | Buffer, callback: SaveCallback): void;
+  save(
+    data: string | Buffer,
+    options: SaveOptions,
+    callback: SaveCallback
+  ): void;
   /**
    * @typedef {object} SaveOptions
    * @extends CreateWriteStreamOptions
@@ -3596,7 +3590,7 @@ class File extends ServiceObject<File, FileMetadata> {
    * resumable feature is disabled.
    * </p>
    *
-   * @param {SaveData} data The data to write to a file.
+   * @param {string | Buffer} data The data to write to a file.
    * @param {SaveOptions} [options] See {@link File#createWriteStream}'s `options`
    *     parameter.
    * @param {SaveCallback} [callback] Callback function.
@@ -3624,7 +3618,7 @@ class File extends ServiceObject<File, FileMetadata> {
    * ```
    */
   save(
-    data: SaveData,
+    data: string | Buffer,
     optionsOrCallback?: SaveOptions | SaveCallback,
     callback?: SaveCallback
   ): Promise<void> | void {
@@ -3644,68 +3638,28 @@ class File extends ServiceObject<File, FileMetadata> {
     }
     const returnValue = retry(
       async (bail: (err: Error) => void) => {
-        if (data instanceof Readable) {
-          // Make sure any pending async readable operations are finished before
-          // attempting to check if the stream is readable.
-          await new Promise(resolve => setImmediate(resolve));
-
-          if (!data.readable || data.destroyed) {
-            // Calling pipeline() with a non-readable stream will result in the
-            // callback being called without an error, and no piping taking
-            // place. In that case, file.save() would appear to succeed, but
-            // nothing would be uploaded.
-            return bail(new Error(FileExceptionMessages.STREAM_NOT_READABLE));
-          }
-        }
-
-        return new Promise<void>((resolve, reject) => {
+        await new Promise<void>((resolve, reject) => {
           if (maxRetries === 0) {
             this.storage.retryOptions.autoRetry = false;
           }
-          const writable = this.createWriteStream(options);
-
-          if (options.onUploadProgress) {
-            writable.on('progress', options.onUploadProgress);
-          }
-
-          const handleError = (err: Error) => {
-            if (
-              !this.storage.retryOptions.autoRetry ||
-              !this.storage.retryOptions.retryableErrorFn!(err)
-            ) {
-              bail(err);
-            }
-
-            reject(err);
-          };
-
-          if (typeof data === 'string' || Buffer.isBuffer(data)) {
-            writable
-              .on('error', handleError)
-              .on('finish', () => resolve())
-              .end(data);
-          } else {
-            pipeline(data, writable, err => {
-              if (err) {
-                // If data is not a valid PipelineSource, then pipeline will
-                // fail without destroying the writable stream. If data is a
-                // PipelineSource that yields invalid chunks (e.g. a stream in
-                // object mode or an iterable that does not yield Buffers or
-                // strings), then pipeline will destroy the writable stream.
-                if (!writable.destroyed) writable.destroy();
-
-                if (typeof data !== 'function') {
-                  // Only PipelineSourceFunction can be retried. Async-iterables
-                  // and Readable streams can only be consumed once.
-                  bail(err);
-                }
-
-                handleError(err);
+          const writable = this.createWriteStream(options)
+            .on('error', err => {
+              if (
+                this.storage.retryOptions.autoRetry &&
+                this.storage.retryOptions.retryableErrorFn!(err)
+              ) {
+                return reject(err);
               } else {
-                resolve();
+                return bail(err);
               }
+            })
+            .on('finish', () => {
+              return resolve();
             });
+          if (options.onUploadProgress) {
+            writable.on('progress', options.onUploadProgress);
           }
+          writable.end(data);
         });
       },
       {
diff --git a/test/file.ts b/test/file.ts
index 567cf77d4..aa050254e 100644
--- a/test/file.ts
+++ b/test/file.ts
@@ -4275,197 +4275,6 @@ describe('File', () => {
         await file.save(DATA, options, assert.ifError);
       });
 
-      it('should save a Readable with no errors', done => {
-        const options = {resumable: false};
-        file.createWriteStream = () => {
-          const writeStream = new PassThrough();
-          writeStream.on('data', data => {
-            assert.strictEqual(data.toString(), DATA);
-          });
-          writeStream.once('finish', done);
-          return writeStream;
-        };
-
-        const readable = new Readable({
-          read() {
-            this.push(DATA);
-            this.push(null);
-          },
-        });
-
-        void file.save(readable, options);
-      });
-
-      it('should propagate Readable errors', done => {
-        const options = {resumable: false};
-        file.createWriteStream = () => {
-          const writeStream = new PassThrough();
-          let errorCalled = false;
-          writeStream.on('data', data => {
-            assert.strictEqual(data.toString(), DATA);
-          });
-          writeStream.on('error', err => {
-            errorCalled = true;
-            assert.strictEqual(err.message, 'Error!');
-          });
-          writeStream.on('finish', () => {
-            assert.ok(errorCalled);
-          });
-          return writeStream;
-        };
-
-        const readable = new Readable({
-          read() {
-            setTimeout(() => {
-              this.push(DATA);
-              this.destroy(new Error('Error!'));
-            }, 50);
-          },
-        });
-
-        file.save(readable, options, (err: Error) => {
-          assert.strictEqual(err.message, 'Error!');
-          done();
-        });
-      });
-
-      it('Readable upload should not retry', async () => {
-        const options = {resumable: false};
-
-        let retryCount = 0;
-
-        file.createWriteStream = () => {
-          retryCount++;
-          return new Transform({
-            transform(
-              chunk: string | Buffer,
-              _encoding: string,
-              done: Function
-            ) {
-              this.push(chunk);
-              setTimeout(() => {
-                done(new HTTPError('retryable error', 408));
-              }, 5);
-            },
-          });
-        };
-        try {
-          const readable = new Readable({
-            read() {
-              this.push(DATA);
-              this.push(null);
-            },
-          });
-
-          await file.save(readable, options);
-          throw Error('unreachable');
-        } catch (e) {
-          assert.strictEqual((e as Error).message, 'retryable error');
-          assert.ok(retryCount === 1);
-        }
-      });
-
-      it('Destroyed Readable upload should throw', async () => {
-        const options = {resumable: false};
-
-        file.createWriteStream = () => {
-          throw new Error('unreachable');
-        };
-        try {
-          const readable = new Readable({
-            read() {
-              this.push(DATA);
-              this.push(null);
-            },
-          });
-
-          readable.destroy();
-
-          await file.save(readable, options);
-        } catch (e) {
-          assert.strictEqual(
-            (e as Error).message,
-            FileExceptionMessages.STREAM_NOT_READABLE
-          );
-        }
-      });
-
-      it('should save a generator with no error', done => {
-        const options = {resumable: false};
-        file.createWriteStream = () => {
-          const writeStream = new PassThrough();
-          writeStream.on('data', data => {
-            assert.strictEqual(data.toString(), DATA);
-            done();
-          });
-          return writeStream;
-        };
-
-        const generator = async function* (arg?: {signal?: AbortSignal}) {
-          await new Promise(resolve => setTimeout(resolve, 5));
-          if (arg?.signal?.aborted) return;
-          yield DATA;
-        };
-
-        void file.save(generator, options);
-      });
-
-      it('should propagate async iterable errors', done => {
-        const options = {resumable: false};
-        file.createWriteStream = () => {
-          const writeStream = new PassThrough();
-          let errorCalled = false;
-          writeStream.on('data', data => {
-            assert.strictEqual(data.toString(), DATA);
-          });
-          writeStream.on('error', err => {
-            errorCalled = true;
-            assert.strictEqual(err.message, 'Error!');
-          });
-          writeStream.on('finish', () => {
-            assert.ok(errorCalled);
-          });
-          return writeStream;
-        };
-
-        const generator = async function* () {
-          yield DATA;
-          throw new Error('Error!');
-        };
-
-        file.save(generator(), options, (err: Error) => {
-          assert.strictEqual(err.message, 'Error!');
-          done();
-        });
-      });
-
-      it('should error on invalid async iterator data', done => {
-        const options = {resumable: false};
-        file.createWriteStream = () => {
-          const writeStream = new PassThrough();
-          let errorCalled = false;
-          writeStream.on('error', () => {
-            errorCalled = true;
-          });
-          writeStream.on('finish', () => {
-            assert.ok(errorCalled);
-          });
-          return writeStream;
-        };
-
-        const generator = async function* () {
-          yield {thisIsNot: 'a buffer or a string'};
-        };
-
-        file.save(generator(), options, (err: Error) => {
-          assert.strictEqual(
-            err.message,
-            'The "chunk" argument must be of type string or an instance of Buffer or Uint8Array. Received an instance of Object'
-          );
-          done();
-        });
-      });
-
       it('buffer upload should retry on first failure', async () => {
         const options = {
           resumable: false,